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<SEC-DOCUMENT>0001062822-09-000118.txt : 20091007
<SEC-HEADER>0001062822-09-000118.hdr.sgml : 20091007
<ACCEPTANCE-DATETIME>20091007165825
ACCESSION NUMBER:		0001062822-09-000118
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20091007
ITEM INFORMATION:		Entry into a Material Definitive Agreement
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20091007
DATE AS OF CHANGE:		20091007

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LEXICON PHARMACEUTICALS, INC./DE
		CENTRAL INDEX KEY:			0001062822
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				760474169
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-30111
		FILM NUMBER:		091110512

	BUSINESS ADDRESS:	
		STREET 1:		8800 TECHNOLOGY FOREST PLACE
		CITY:			THE WOODLANDS
		STATE:			TX
		ZIP:			77381
		BUSINESS PHONE:		2818633000

	MAIL ADDRESS:	
		STREET 1:		8800 TECHNOLOGY FOREST PLACE
		CITY:			THE WOODLANDS
		STATE:			TX
		ZIP:			77381

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	LEXICON GENETICS INC/TX
		DATE OF NAME CHANGE:	20000126
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
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<FILENAME>form8k10072009.htm
<DESCRIPTION>FORM 8-K
<TEXT>
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STATES</font></div>
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AND EXCHANGE COMMISSION</font></div>
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D.C. 20549</font></div>
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8-K</font></div>
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REPORT</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
to Section 13 or 15(d) of the Securities Exchange Act of 1934</font></div>
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of Report (Date of earliest event
reported):&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;October
7, 2009</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 18pt; FONT-FAMILY: Times New Roman">Lexicon
Pharmaceuticals, Inc.</font></div>
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name of registrant as specified in its charter)</font></div>
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Technology Forest Place</font></div>
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Woodlands, Texas 77381</font></div>
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863-3000</font></div>
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provisions:</font></div>
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                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Soliciting
      material pursuant to Rule 14a-12 under the Exchange Act (17&#160;CFR
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                <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pre-commencement
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    <div>&#160;</div>
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    </div>
    <div>
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    </div>
    <div>
      <div>&#160;</div>
      <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
        <div id="FTR">
          <div id="GLFTR" style="WIDTH: 100%" align="left">&#160;</div>
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        <div id="PN" style="PAGE-BREAK-AFTER: always">
          <div style="WIDTH: 100%; TEXT-ALIGN: center">&#160;</div>
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            <hr style="COLOR: black" noshade size="2">
          </div>
        </div>
        <div id="HDR">
          <div id="GLHDR" style="WIDTH: 100%" align="right">&#160;</div>
        </div>
      </div>
      <div>
        <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
            <tr valign="top">
              <td style="WIDTH: 108pt">
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">Item
      1.01</font></div>
              </td>
              <td>
                <div align="justify"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">Entry
      into a Material Definitive
Agreement</font></div>
              </td>
            </tr>
        </table>
      </div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
October 7, 2009, we entered into an amendment to our securities purchase
agreement, dated June 17, 2007, with Invus, L.P., under which Invus made an
initial investment of $205.4 million to purchase 50,824,986 shares of our common
stock in August 2007 and has the right to require us to initiate up to two pro
rata rights offerings to our stockholders, which would provide all stockholders
with non-transferable rights to acquire shares of our common stock, in an
aggregate amount of up to $344.5&#160;million, less the proceeds of any
&#8220;qualified offerings&#8221; that we may complete in the interim involving the sale of
our common stock at prices above $4.50 per share.</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
amendment, which was entered into in connection with a proposed public offering
of our common stock and will become effective upon (and subject to) the
completion of such offering and Invus&#8217; grant of consent with respect thereto,
includes the following modifications to the original terms of the securities
purchase agreement:</font></div>
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      <div>
        <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
            <tr valign="top">
              <td style="WIDTH: 36pt">
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
              </td>
              <td style="WIDTH: 18pt">
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline;" face="Symbol, serif">&#183;</font></font></div>
              </td>
              <td>
                <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Prior
      to giving effect to the amendment, Invus could exercise its right to
      require us to conduct the first rights offering by giving us notice within
      a period of 90 days beginning on November 28, 2009 (which we refer to as
      the first rights offering trigger date), although we and Invus could agree
      to change the first rights offering trigger date with the approval of the
      members of our board of directors who are not affiliated with
      Invus.&#160;&#160;In the amendment, we have agreed to extend by nine
      months the period during which Invus may exercise its right to require us
      to conduct the first rights offering, resulting in Invus having such right
      for a period of one year beginning on the first rights offering trigger
      date.</font></div>
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      <div>
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            <tr valign="top">
              <td style="WIDTH: 36pt">
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
              </td>
              <td style="WIDTH: 18pt">
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline;" face="Symbol, serif">&#183;</font></font></div>
              </td>
              <td>
                <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Prior
      to giving effect to the amendment, Invus could exercise its right to
      require us to conduct a second rights offering by giving us notice within
      a period of 90 days beginning on the date that is 12 months after Invus&#8217;
      exercise of its right to require us to conduct the first rights offering
      or, if Invus does not exercise its right to require us to conduct the
      first rights offering, within a period of 90 days beginning on the first
      anniversary of the first rights offering trigger date.&#160;&#160;In the
      amendment, we have agreed to modify the timing of this right to permit
      Invus to exercise its right to require us to conduct the second rights
      offering by giving us notice within a period of one year beginning on the
      date (which we refer to as the first rights offering trigger date) that is
      90 days after Invus&#8217; exercise of its right to require us to conduct the
      first rights offering or, if Invus does not exercise its right to require
      us to conduct the first rights offering, within a period of one year
      beginning on the first anniversary of the first rights offering trigger
      date.</font></div>
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            </tr>
        </table>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div>
        <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
            <tr valign="top">
              <td style="WIDTH: 36pt">
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
              </td>
              <td style="WIDTH: 18pt">
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline;" face="Symbol, serif">&#183;</font></font></div>
              </td>
              <td>
                <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Prior
      to giving effect to the amendment, if Invus elected to exercise its rights
      to require us to initiate a rights offering, Invus was required to
      purchase its pro rata portion of the offering, and to commit to purchase
      the entire portion of the offering not subscribed for by other
      stockholders.&#160;&#160;In the amendment, we have agreed to modify these
      obligations such that, if Invus elects to exercise its rights to require
      us to initiate a rights offering, Invus will be required to purchase only
      its pro rata portion of the rights offering, and will not be obligated to
      purchase the entire portion of the offering not subscribed for by other
      stockholders.</font></div>
              </td>
            </tr>
        </table>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div>
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            <tr valign="top">
              <td style="WIDTH: 36pt">
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
              </td>
              <td style="WIDTH: 18pt">
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline;" face="Symbol, serif">&#183;</font></font></div>
              </td>
              <td>
                <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Upon
      effectiveness of the amendment, the amended securities purchase agreement
      provides that, if we notify Invus of a proposed public offering for an
      offering above $4.50 per share during the period in which Invus may
      initiate a rights offering, Invus will have a period of 10 business days
      in which to exercise its right to require us to conduct a rights offering,
      in which case we would be required to forego the proposed public offering
      and proceed with the rights offering.&#160;&#160;In the event that Invus
      does not exercise its right to require us to conduct a rights offering
      within such period, we will have the right to conduct the proposed public
      offering, and Invus will not initiate a rights offering (a) for an initial
      period of 30 days and (b) so long as the offering occurs within that
      30-day period, and if requested by the underwriters for the public
      offering, for an additional period of 90 days, provided that we may
      exercise this &#8220;blackout right&#8221; only once in any 12-month
      period.&#160;&#160;In such event, the one-year period in which Invus may
      initiate a rights offering (and, if the blackout period occurs during the
      period in which Invus may initiate the first rights offering, the second
      rights offering trigger date) will be tolled by a number of days equal to
      the aggregate number of days the blackout period is in
    effect.</font></div>
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        </div>
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          <div style="WIDTH: 100%; TEXT-ALIGN: center">
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        </div>
        <div id="HDR">
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        </div>
      </div>
      <div>
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            <tr valign="top">
              <td style="WIDTH: 36pt">
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      </font></div>
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              </td>
              <td>
                <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      amended securities purchase agreement will permit us, at our option, to
      file and use a shelf registration statement for purposes of any rights
      offerings rather than filing a new registration statement after receiving
      a rights offering notice.</font></div>
              </td>
            </tr>
        </table>
      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div>
        <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%">
            <tr valign="top">
              <td style="WIDTH: 36pt">
                <div><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
      </font></div>
              </td>
              <td style="WIDTH: 18pt">
                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline;" face="Symbol, serif">&#183;</font></font></div>
              </td>
              <td>
                <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      amended securities purchase agreement will change the timing of the
      pricing of a rights offering from the time of delivery of notice by Invus
      of its exercise of its right to require us to conduct such rights offering
      to the time the record date for the distribution of the rights to our
      stockholders is established by our board of
  directors.</font></div>
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                <div style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; FONT-WEIGHT: bold">Item
9.01</font></font></div>
              </td>
              <td>
                <div align="justify"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; FONT-WEIGHT: bold">Financial Statements and
      Exhibits</font></font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(d)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Exhibits</font></div>
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            <tr>
              <td valign="top" width="11%" style="BORDER-BOTTOM: black 2px solid">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline">Exhibit No.</font></font></div>
              </td>
              <td valign="top" width="69%" style="BORDER-BOTTOM: black 2px solid">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline">Description</font></font></div>
              </td>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">10.1</font></div>
              </td>
              <td align="left" valign="top" width="69%">
                <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: -36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#8212;Amendment,
      dated October 7, 2009, to Securities Purchase Agreement, dated
      June&#160;17, 2007, with Invus,
L.P.</font></div>
              </td>
            </tr>
        </table>
      </div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
        <div id="FTR">
          <div id="GLFTR" style="WIDTH: 100%" align="left">&#160;</div>
        </div>
        <div id="PN" style="PAGE-BREAK-AFTER: always">
          <div style="WIDTH: 100%; TEXT-ALIGN: center">&#160;</div>
          <div style="WIDTH: 100%; TEXT-ALIGN: center">
            <hr style="COLOR: black" noshade size="2">
          </div>
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        <div id="HDR">
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">Signatures</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
to the requirements of the Securities Exchange Act of 1934, the registrant has
duly caused this report to be signed on its behalf by the undersigned thereunto
duly authorized.</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
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            <tr>
              <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
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      Pharmaceuticals, Inc.</font></div>
              </td>
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      </font></td>
              <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
              <td valign="top" width="32%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
            </tr>
            <tr>
              <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
              <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
              <td valign="top" width="32%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Date:&#160;&#160;October
      7, 2009</font></div>
              </td>
              <td valign="top" width="5%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">By:</font></div>
              </td>
              <td valign="top" width="32%" style="BORDER-BOTTOM: black 2px solid">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">/s/
      Jeffrey L. Wade</font></div>
              </td>
            </tr>
            <tr>
              <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
              <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
              <td valign="top" width="32%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Jeffrey
      L. Wade</font></div>
              </td>
            </tr>
            <tr>
              <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
              <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; FONT-STYLE: italic">Executive Vice</font> <font style="DISPLAY: inline; FONT-STYLE: italic">President
      and</font></font></div>
              </td>
            </tr>
            <tr>
              <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
              <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
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      Counsel</font></div>
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            </tr>
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<DOCUMENT>
<TYPE>EX-10.1
<SEQUENCE>2
<FILENAME>exh10_1.htm
<DESCRIPTION>EXHIBIT 10.1
<TEXT>
<html>
  <head>
    <title>exh10_1.htm</title>
<!-- Licensed to: Lexicon Pharmaceuticals-->
<!-- Document Created using EDGARizer 4.0.7.0 -->
<!-- Copyright 1995 - 2008 EDGARfilings, Ltd., an IEC company. All rights reserved -->
</head>
    <body bgcolor="#ffffff" style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">AMENDMENT
TO</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">SECURITIES
PURCHASE AGREEMENT</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 72pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">This
Amendment to Securities Purchase Agreement (this &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Amendment</font>&#8221;) is
entered into as of October 7, 2009 by and between Invus, L.P., a Bermuda limited
partnership (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Investor</font>&#8221;), and
Lexicon Pharmaceuticals, Inc., a Delaware corporation (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Company</font>&#8221;).&#160;&#160;Capitalized
terms used but not otherwise defined herein shall have the meanings ascribed to
them in the Securities Purchase Agreement (as defined below).</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">W I T N E
S S E T H :</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 72pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">WHEREAS,
the Investor and the Company entered into that certain Securities Purchase
Agreement, dated as of June 17, 2007 (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Securities Purchase
Agreement</font>&#8221;), and that certain Stockholders&#8217; Agreement, made as of June
17, 2007 (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Stockholders&#8217;
Agreement</font>&#8221;);</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 72pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">WHEREAS,
the Company desires to issue and sell shares of Company Common Stock in an
underwritten offering registered under the Securities Act (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Offering</font>&#8221;), which
Offering requires the consent of the Investor under the Securities Purchase
Agreement; and</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 72pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">WHEREAS,
in connection with the Offering, the Investor and the Company desire to amend
the Securities Purchase Agreement as set forth below to (a) modify the
definition of Second Rights Offering Trigger Date, (b) extend the period during
which the Investor may deliver the First Rights Offering Notice and Second
Rights Offering Notice from ninety (90) days to one (1) year after the First
Rights Offering Trigger Date and Second Rights Offering Trigger Date,
respectively, (c) eliminate the Investor&#8217;s obligation to purchase unsubscribed
Rights Shares at the expiration of a Rights Offering, and (d) make certain other
amendments to the terms thereof.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 72pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">NOW,
THEREFORE, intending to be legally bound hereby, the parties hereto hereby agree
as follows:</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Section
1.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Amendment to Section 1.01 of
the Securities Purchase Agreement</font></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>The definition of &#8220;Oversubscription Pro
Rata Number&#8221; in Section 1.01 of the Securities Purchase Agreement is hereby
amended and restated in its entirety to read as follows:</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Oversubscription Pro Rata
Number</font>&#8221; shall mean, for each holder of a Right exercising Rights Offering
Oversubscription rights, a fraction the numerator of which is the total number
of shares of Company Common Stock owned by such holder and the denominator of
which is the total number of outstanding shares of Company Common Stock held by
all holders of Rights who have validly exercised Rights Offering
Oversubscription rights in the relevant Rights Offering (it being understood
that no shares shall be deemed owned by more than one holder for purposes
hereof); <font style="DISPLAY: inline; FONT-STYLE: italic">provided</font> that,
to the extent any holders validly exercising Rights Offering Oversubscription
rights exercise such rights with respect to less than their entire respective
Oversubscription Pro Rata Numbers of Oversubscription Shares (with the
unsubscribed-for Oversubscription Shares being referred to as &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Excess Oversubscription
Shares</font>&#8221;), the Oversubscription Pro Rata Numbers of all other holders
validly exercising Rights Offering Oversubscription rights in full shall be
increased proportionately up to the maximum number of Oversubscription Shares
such holders elect to purchase (it being the intent of this provision that the
Oversubscription Pro Rata Numbers be established such that any such Excess
Oversubscription Shares be allocated among holders exercising Rights Offering
Oversubscription rights in full on a pro rata basis based on the number of
Oversubscription Shares allocated to such holders, up to the total number of
Excess Oversubscription Shares such holders elect to purchase); <font style="DISPLAY: inline; FONT-STYLE: italic">provided further</font>, with the
written consent of both the Investor and the Company, the determination of the
Oversubscription Pro Rata Number may be based on another customary proration
method.</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>Section 1.01 of the Securities Purchase
Agreement is hereby amended by adding the following definition of
&#8220;Oversubscription Shares&#8221; immediately after the definition of &#8220;Oversubscription
Pro Rata Number&#8221; therein as follows:</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Oversubscription
Shares</font>&#8221; shall mean First Rights Offering Oversubscription Shares in the
First Rights Offering or Second Rights Offering Oversubscription Shares in the
Second Rights Offering, as applicable.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>The definition of &#8220;Second Rights
Offering Trigger Date&#8221; in Section 1.01 of the Securities Purchase Agreement is
hereby amended and restated in its entirety to read as follows:</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Second Rights Offering
Trigger Date</font>&#8221; means the date that is (i) ninety (90) days after the
delivery of the First Rights Offering Notice or (ii) if such notice is not
delivered, the date of the expiration of the period (as it may be extended by
any Rights Offering Notice Blackout Period) in which the Investor may give
notice to require the Company to conduct the First Rights Offering pursuant to
Section 3.01(a).</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Section
2.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Amendments to Section 3.01
of the Securities Purchase Agreement</font></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The first
sentence of Section 3.01(a) of the Securities Purchase Agreement is hereby
amended and restated in its entirety to read as follows:</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Subject
to Section 3.03(e), for a period of one (1) year following the First Rights
Offering Trigger Date, the Investor shall have the right, but not the
obligation, exercisable by a written notice (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">First Rights Offering
Notice</font>&#8221;) to the Company in accordance with Section 10.02, to require the
Company to make a pro rata offering (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">First Rights
Offering</font>&#8221;) to all holders of Company Common Stock (including the Investor
and its affiliates) of non-transferable subscription rights (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">First Rights</font>&#8221;)
entitling the holders thereof to purchase shares of Company Common Stock, on the
terms set forth herein, (i) in an aggregate amount equal to the First Rights
Offering Amount, and (ii) at a price per share (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">First Rights Offering
Price</font>&#8221;) to be designated by the Investor at any time on or after delivery
of the First Rights Offering Notice and before the establishment of the record
date for the distribution of the First Rights to the Company&#8217;s stockholders
(provided that the establishment of such record date shall not be prior to the
time the First Rights Offering Registration Statement shall have been declared
effective by the SEC) by written notice&#160;&#160;(the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">First Rights Offering
Pricing Notice</font>&#8221;) to the Company in accordance with Section 10.02; <font style="DISPLAY: inline; FONT-STYLE: italic">provided</font> that the First
Rights Offering Price shall be any price (A) at or above the lower of $4.50 (as
adjusted for any stock splits, reverse splits, stock dividends, combinations or
similar transactions occurring after the date hereof and prior to the First
Rights Offering) and the average of the volume weighted average trading prices
of the Company Common Stock on the Nasdaq Stock Market for the ten (10) full
trading days immediately prior to the date of the First Rights Offering Pricing
Notice (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">First
Rights Offering Market Price</font>&#8221;) and (B) at or below the higher of $4.50
(as adjusted for any stock splits, reverse splits, stock dividends, combinations
or similar transactions occurring after the date hereof and prior to the First
Rights Offering) and the First Rights Offering Market Price.</font></div>
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        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
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      </div>
    </div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>Section 3.01(b) of the Securities
Purchase Agreement is hereby amended and restated in its entirety to read as
follows:</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(b)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;In
connection with the First Rights Offering, upon the terms and subject to the
conditions of this Agreement, the Investor shall be required to subscribe for
and purchase a number of First Rights Shares that is not less than its Pro Rata
Number of First Rights Shares.</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Section
3.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Amendments to Section 3.02
of the Securities Purchase Agreement</font></font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The first
sentence of Section 3.02(a) of the Securities Purchase Agreement is hereby
amended and restated in its entirety to read as follows:</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Subject
to Section 3.03(e), for a period of one (1) year following the Second Rights
Offering Trigger Date, the Investor shall have the right, but not the
obligation, exercisable by written notice (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Second Rights Offering
Notice</font>&#8221; and, together with the First Rights Offering notice, the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Rights Offering
Notices</font>&#8221;) to the Company in accordance with Section 10.02, to require the
Company to make a pro rata offering (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Second Rights
Offering</font>&#8221; and, together with the First Rights Offering, the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Rights Offerings</font>&#8221;) to
all holders of Company Common Stock (including the Investor and its affiliates)
of non-transferable subscription rights (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Second Rights</font>&#8221; and,
together with the First Rights, the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Rights</font>&#8221;) entitling
the holders thereof to purchase shares of Company Common Stock, on the terms set
forth herein, (i) in an aggregate amount equal to the Second Rights Offering
Amount, and (ii) at a price per share (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Second Rights Offering
Price</font>&#8221;) to be designated by the Investor at any time on or after delivery
of the Second Rights Offering Notice and before the establishment of the record
date for the distribution of the Second Rights to the Company&#8217;s stockholders
(provided that the establishment of such record date shall not be prior to the
time the Second Rights Offering Registration Statement shall have been declared
effective by the SEC) by written notice&#160;&#160;(the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Second Rights Offering
Pricing Notice</font>&#8221;) to the Company in accordance with Section 10.02; <font style="DISPLAY: inline; FONT-STYLE: italic">provided</font> that the Second
Rights Offering Price shall be any price (A) at or above the lower of $4.50 (as
adjusted for any stock splits, reverse splits, stock dividends, combinations or
similar transactions occurring after the date hereof and prior to the Second
Rights Offering) and the average of the volume weighted average trading prices
of the Company Common Stock on the Nasdaq Stock Market for the ten (10) full
trading days immediately prior to the date of the Second Rights Offering Pricing
Notice (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Second
Rights Offering Market Price</font>&#8221;) and (B) at or below the higher of $4.50
(as adjusted for any stock splits, reverse splits, stock dividends, combinations
or similar transactions occurring after the date hereof and prior to the Second
Rights Offering) and the Second Rights Offering Market Price.</font></div>
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        <div style="WIDTH: 100%; TEXT-ALIGN: center">
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    </div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>Section 3.02(b) of the Securities
Purchase Agreement is hereby amended and restated in its entirety to read as
follows:</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(b)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;In
connection with the Second Rights Offering, upon the terms and subject to the
conditions of this Agreement, the Investor shall be required to subscribe for
and purchase a number of Second Rights Shares that is not less than its Pro Rata
Number of Second Rights Shares.</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Section
4.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Amendment to Section 3.03 of
the Securities Purchase Agreement</font></font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>Section 3.03 of the Securities Purchase
Agreement is hereby amended by adding new Section 3.03(e) at the end thereof as
follows:</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(e)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;In
the event that the Company delivers a bona fide Notice of Issuance in connection
with a Marketed Offering (in each case, as such terms are defined and
contemplated by Section 4.02 of the Stockholders&#8217; Agreement) to the Investor
during the period in which the Investor may deliver any Rights Offering Notice
under Section 3.01(a) or Section 3.02(a), the Investor shall have the right, for
a period of ten (10) business days from the date of receipt of such Notice of
Issuance, to deliver a Rights Offering Notice to the Company, in which case the
Company shall retract the Notice of Issuance, proceed with the Rights Offering
contemplated by the Investor&#8217;s notice, and forego the Marketed Offering
contemplated thereby until such Rights Offering is completed or, with the
consent of the Investor, terminated.&#160;&#160;In the event that the Investor
does not deliver such Rights Offering Notice to the Company upon the expiration
of such ten (10) business day period, the Company shall have the right to
conduct the Marketed Offering contemplated by the Notice of Issuance, and the
Investor shall not deliver a Rights Offering Notice to the Company (i) for a
period of thirty (30) days from the date of delivery by the Company of the
Notice of Issuance (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Initial Rights Offering
Notice Blackout Period</font>&#8221;) and (ii) so long as the offering of New
Securities (as defined in the Stockholders&#8217; Agreement) described in such Notice
of Issuance occurs within the Initial Rights Offering Notice Blackout Period,
and only if requested in writing by the underwriters for the Marketed Offering
contemplated by such Notice of Issuance, for a period of ninety (90) days from
the date of issuance of the New Securities contemplated by such Notice of
Issuance (such period, together with the Initial Rights Offering Notice Blackout
Period, the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Rights
Offering Notice Blackout Periods</font>&#8221;).&#160;&#160;Notwithstanding anything
to the contrary in the foregoing, the Company may exercise its right to cause
Rights Offering Notice Blackout Periods under this Section 3.03(e) only once in
any twelve (12) month period; <font style="DISPLAY: inline; FONT-STYLE: italic">provided</font> that, for such
purposes, the Company shall not be deemed to have exercised such right if,
following the Company&#8217;s delivery of a Notice of Issuance in connection with a
Marketed Offering, the Investor shall have delivered a Rights Offering Notice to
the Company and the Company shall have retracted such Notice of Issuance in
accordance with this Section 3.03(e); and <font style="DISPLAY: inline; FONT-STYLE: italic">provided, further,</font> that
nothing in this Section 3.03(e) shall prohibit the Company from conducting a
Marketed Offering without exercising its right to cause a Rights Offering Notice
Blackout Period under this Section 3.03(e).&#160;&#160;The running of the period
in which the Investor may deliver any Rights Offering Notice under Section
3.01(a) or Section 3.02(a), as applicable, shall be tolled while any Rights
Offering Notice Blackout Period is in effect.</font></div>
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    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Section
5.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Addition of Section 3.04 of
the Securities Purchase Agreement</font></font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>The Securities Purchase Agreement is
hereby amended by adding new Section 3.04:</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 36pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">SECTION
3.04.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Shelf
Registration</font>.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(a)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;So
long as it would not reasonably be expected to materially delay the applicable
Rights Offering, (i) the Company may, at its option, file with the SEC one or
more shelf registration statements on Form S-3 (or, if Form S-3 is not then
available to the Company, on such form of registration statement as is then
available to effect a registration of securities), in form and substance
reasonably satisfactory to the Investor, covering the issuance of Rights and
Rights Shares, together with such other securities as the Company may elect
(together with the prospectus relating thereto and any prospectus supplement and
offering documents, a &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Shelf Registration
Statement</font>&#8221;) and (ii) in the event the Company has in effect, at the time
of the Investor&#8217;s delivery of a Rights Offering Notice, an effective Shelf
Registration Statement sufficient to cover the issuance of the Rights and the
Rights Shares to be offered in such Rights Offering, then rather than filing a
Rights Offering Registration Statement pursuant to Section 3.01(c) or 3.02(c),
as applicable, the Company shall be entitled to employ such Shelf Registration
Statement as the relevant Rights Offering Registration Statement for purposes of
such Rights Offering. Any such Shelf Registration Statement (and each amendment
or supplement thereto, and each request for acceleration of effectiveness
thereof) will be provided to the Investor prior to its filing with or other
submission to the SEC.&#160;&#160;The Company shall not include any other
securities in the prospectus supplement relating to any Rights
Offering.&#160;&#160;Any such Shelf Registration Statement employed as a Rights
Offering Registration Statement will comply in all material respects with the
requirements of the Securities Act and the rules and regulations thereunder and
other applicable Laws.&#160;&#160;The Company promptly will correct any
information included in any Shelf Registration Statement employed as a Rights
Offering Registration Statement if, and to the extent that, such information
becomes false or misleading in any material respect, and the Company will take
all steps necessary to cause the applicable prospectus (including any applicable
prospectus supplement) contained in such Shelf Registration Statement employed
as a Rights Offering Registration Statement, as so corrected, to be filed with
the SEC and to be disseminated to the distributees of Rights, in each case as
and to the extent required by applicable federal securities laws.&#160;&#160;The
Investor will be given a reasonable opportunity to review and comment upon any
Shelf Registration Statement in each instance before it is filed with the
SEC.&#160;&#160;In addition, the Company will provide the Investor with any
written comments or other written communications that the Company receives from
time to time from the SEC or its staff with respect to any Shelf Registration
Statement promptly after the receipt of such comments or other
communications.</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(b)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Notwithstanding
the provisions of Section 3.01(d) or 3.02(d), as applicable, in the event the
Company employs a Shelf Registration Statement as the relevant Rights Offering
Registration Statement for purposes of a Rights Offering, the Company will
commence such Rights Offering as soon as reasonably practicable following its
receipt of the Rights Offering Notice relating thereto.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Section
6.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Amendment to Section 6.02(a)
of the Securities Purchase Agreement</font></font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>Section 6.02(a) of the Securities
Purchase Agreement is hereby amended and restated in its entirety to read as
follows:</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 36pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(a)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Until
(i) the completion of the Second Rights Offering as contemplated by Section 3.02
or (ii) the expiration of the period following the Second Rights Offering
Trigger Date during which the Investor may exercise its right to require the
Company to conduct the Second Rights Offering (as such period may be extended),
if the Investor does not exercise such right within such period, the prior
written consent of the Investor shall be required for the issuance by the
Company of any shares of Company Common Stock for a per share price of less than
$4.50 (as adjusted for any stock splits, reverse splits, stock dividends,
combinations or similar transactions occurring after the date hereof and prior
to the Second Rights Offering); <font style="DISPLAY: inline; FONT-STYLE: italic">provided</font> that the provisions
of this Section 6.02 shall not apply to the issuance of Company Common Stock (A)
pursuant to employee or director stock option, incentive compensation or similar
plans approved by the Board or a duly authorized committee thereof or such
committee, (B) to persons involved in the pharmaceutical industry in connection
with simultaneous strategic transactions involving such persons in the ordinary
course or (C) in connection with the exercise, on or after February 27, 2011, of
the Company&#8217;s option to acquire Symphony Icon, Inc. in accordance with the terms
of its Purchase Option Agreement among the Company, Symphony Icon Holdings LLC
and Symphony Icon, Inc., as such agreement is in effect on October 6,
2009.</font></div>
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        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
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        </div>
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Section
7.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Consent to Further
Amendments; Further Assurances</font></font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>The parties hereto hereby consent to
such other amendments and changes to the Securities Purchase Agreement and
Ancillary Agreements as necessary to give effect to the intent of this Amendment
and shall execute and deliver or cause to be executed and delivered any
additional documents, certificates, consents, waivers and instruments and
perform any additional acts that may be reasonably necessary or appropriate to
effectuate and perform the provisions of this Amendment and those transactions
contemplated herein.</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Section
8.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Consent to Waiver of
Investor Election Period in Sections 4.02(b) and 4.02(c)</font><font style="DISPLAY: inline; TEXT-DECORATION: underline">of the Stockholders&#8217;
Agreement; Rights Offering Blackout</font></font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>(a)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;With
respect to the Offering (including any related overallotment option), the
Company and the Investor hereby waive any applicability to the Offering of the
notice provisions contained in Sections 4.02(b) and (c) of the Stockholders&#8217;
Agreement and agree that notice will be delivered as follows: the Company shall
deliver a Notice of Issuance specifying the price to public and number of shares
to be sold to public in the Offering on the date the underwriting agreement is
expected to be signed by the Company in connection with the Offering and, upon
receipt of such notice by the Investor, the Investor (i) shall exercise its
rights under Section 4.02 with respect to the Offering by delivering notice of
such exercise substantially concurrently with the signing by the Company of the
underwriting agreement with respect thereto, and (ii) shall retain the right to
make an election whether to exercise its rights under Section 4.02 with respect
to any additional New Securities issued upon the exercise by the underwriters of
their overallotment option in connection with such Offering by delivering notice
of such exercise as promptly as practicable following the Company&#8217;s notice to
the Investor of the underwriters&#8217; exercise of such option.&#160;For the
avoidance of doubt, with respect to the Offering, the Investor waives its right
to deliver notice of its intent to participate in the Offering ten (10) business
days following receipt of the Notice of Issuance related thereto.</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>(b)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;The
Investor agrees not to exercise its right to cause the Company to conduct a
Rights Offering during the ninety (90) day period following the delivery of the
Offering Consent (as defined in Section 9 hereof).&#160;&#160;Notwithstanding
the amendments to Section 3.03 of the Securities Purchase Agreement effected
hereby, the periods in which the Investor may deliver any Rights Offering Notice
under Section 3.01(a) and Section 3.02(a) shall not be extended by such ninety
(90) day period, and shall not be deemed to be an exercise of the Company&#8217;s
right to cause Rights Offering Notice Blackout Periods under Section
3.03(e).</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>(c)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;The
Investor expressly acknowledges and agrees that the provisions of Sections
4.02(b) and 4.02(c) of the Stockholders&#8217; Agreement relating to the free
transferability of shares to be received in the Offering shall not affect its
obligations under its &#8220;lock-up&#8221; agreement dated October 5, 2009 with the
underwriters, which restricts the transferability of New Securities to be issued
by the Company in connection with the Offering.</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
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        <div style="WIDTH: 100%; TEXT-ALIGN: center">
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        </div>
      </div>
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      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Section
9.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Effectiveness;
Termination</font></font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">This
Amendment shall become effective only upon delivery by the Investor to the
Company, pursuant to Section 6.02(a) of the Securities Purchase Agreement, of
the Investor&#8217;s written consent to the Offering substantially in the form of
Exhibit A hereto (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Offering
Consent</font>&#8221;).&#160;&#160;Notwithstanding any such delivery, in the event
that the underwriting agreement relating to the Offering is not executed on or
before October 13, 2009, (i) this Amendment shall terminate and cease to have
any force or effect and (ii) the Offering Consent shall be of no force or
effect.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Section
10.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Ratification and
Confirmation</font></font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
Securities Purchase Agreement and Stockholders&#8217; Agreement, as hereby amended or
supplemented, are hereby ratified and confirmed in all respects.&#160;&#160;This
Amendment shall be interpreted and construed together with, and as a part of,
the Securities Purchase Agreement or Stockholders&#8217; Agreement, as
applicable.&#160;&#160;Any reference in any other document to the Securities
Purchase Agreement or Stockholders&#8217; Agreement shall be deemed to refer to the
Securities Purchase Agreement or Stockholders&#8217; Agreement, as applicable, as
modified by this Amendment.&#160;&#160;The execution, delivery and effectiveness
of this Amendment shall not constitute a modification or waiver of any provision
of the Securities Purchase Agreement or Stockholders&#8217; Agreement except as
expressly provided herein.</font></div>
    <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; FONT-WEIGHT: bold">Section
11.</font>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; FONT-WEIGHT: bold; TEXT-DECORATION: underline">Governing
Law</font></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">This
Amendment shall be governed by, and construed in accordance with, the laws of
the State of New York.&#160;&#160;All actions and proceedings arising out of or
relating to this Amendment shall be heard and determined exclusively in any New
York state or federal court, in each case sitting in the Borough of
Manhattan.&#160;&#160;The parties hereto hereby (a) submit to the exclusive
jurisdiction of any New York state or federal court, in each case sitting in the
Borough of Manhattan, for the purpose of any Action arising out of or relating
to this Amendment brought by any party hereto, and (b) irrevocably waive, and
agree not to assert by way of motion, defense, or otherwise, in any such Action,
any claim that it is not subject personally to the jurisdiction of the
above-named courts, that its property is exempt or immune from attachment or
execution, that the Action is brought in an inconvenient forum, that the venue
of the Action is improper, or that this Amendment may not be enforced in or by
any of the above-named courts.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Section
12.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Counterparts</font></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">This
Amendment may be executed and delivered (including by facsimile transmission) in
one or more counterparts, and by the different parties hereto in separate
counterparts, each of which when executed and delivered shall be deemed to be an
original but all of which taken together shall constitute one and the same
agreement.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-STYLE: italic; FONT-FAMILY: Times New Roman">[Signature
Page Follows]</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt; TEXT-ALIGN: left" align="center">&#160;</div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 72pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">IN
WITNESS WHEREOF, the Investor and the Company have caused this Amendment to be
executed as of the date first written above by their respective officers
thereunto duly authorized.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left">
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div>
        <div align="justify">
          <div align="justify">
            <div align="justify">
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                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
                    <td colspan="2" valign="top" width="37%"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;INVESTOR:</font></td>
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                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
                    <td colspan="2" valign="top" width="37%"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
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                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td colspan="2" valign="top" width="37%">
                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-WEIGHT: normal; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">INVUS,
      L.P.</font></div>
                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font size="2">a Bermuda limited
partnership</font></div>
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                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="32%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                  </tr>
                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="32%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                  </tr>
                  <tr>
                    <td valign="top" width="43%">
                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
                    </td>
                    <td valign="top" width="5%">
                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">By:</font></div>
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                    <td align="justify" valign="top" width="32%" style="BORDER-BOTTOM: black 1px solid">
                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">/s/
      Raymond Debbane</font></div>
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                  </tr>
                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Name:</font></td>
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                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Raymond
      Debbane</font></div>
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                  </tr>
                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
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                    <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Title:</font></td>
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                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="DISPLAY: inline; FONT-STYLE: normal">President, Invus Advisors,
      L.L.C.</font></font></div>
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                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="32%">
                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
                    </td>
                  </tr>
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            </div>
          </div>
        </div>
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      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
      <div>
        <div align="justify">
          <div align="justify">
            <div align="justify">
              <table cellpadding="0" cellspacing="0" width="100%">
                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
                    <td colspan="2" valign="top" width="37%"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;COMPANY</font></td>
                  </tr>
                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
                    <td colspan="2" valign="top" width="37%"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;</font></td>
                  </tr>
                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
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                    <td colspan="2" valign="top" width="37%">
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      Pharmaceuticals, Inc.,</font></div>
                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font size="2">a Delaware corporation</font></div>
                    </td>
                  </tr>
                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="32%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                  </tr>
                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="32%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                  </tr>
                  <tr>
                    <td valign="top" width="43%">
                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
                    </td>
                    <td valign="top" width="5%">
                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">By:</font></div>
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                    <td align="justify" valign="top" width="32%" style="BORDER-BOTTOM: black 1px solid">
                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">/s/
      Jeffrey L. Wade</font></div>
                    </td>
                  </tr>
                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Name:</font></td>
                    <td valign="top" width="32%">
                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Jeffrey
      L. Wade</font></div>
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                  </tr>
                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Title:</font></td>
                    <td valign="top" width="32%">
                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"><font style="FONT-STYLE: normal"><font style="DISPLAY: inline; FONT-STYLE: normal">Executive Vice</font> <font style="DISPLAY: inline; FONT-STYLE: normal">President
      and</font></font></font></div>
                    </td>
                  </tr>
                  <tr>
                    <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                    <td valign="top" width="32%">
                      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-STYLE: normal; FONT-FAMILY: times new roman">General
      Counsel</font></div>
                    </td>
                  </tr>
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            </div>
          </div>
        </div>
      </div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br>&#160;</div>
      <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
        <div id="FTR">
          <div id="GLFTR" style="WIDTH: 100%" align="left">
          </div>
        </div>
        <div id="PN" style="PAGE-BREAK-AFTER: always">
          <div style="WIDTH: 100%; TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">8</font></div>
          <div style="WIDTH: 100%; TEXT-ALIGN: center">
            <hr style="COLOR: black" noshade size="2">
          </div>
        </div>
        <div id="HDR">
          <div id="GLHDR" style="WIDTH: 100%" align="right">
          </div>
        </div>
      </div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt; TEXT-ALIGN: right"><font style="FONT-WEIGHT: bold; TEXT-DECORATION: underline">Exhibit A</font></div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt">
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">NOTICE
OF</font></font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">CONSENT TO
OFFERING</font></font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">October
__, 2009</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Invus,
L.P.</font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">c/o The
Invus Group, L.L.C.</font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">750
Lexington Avenue (30<font style="DISPLAY: inline; FONT-SIZE: 70%; VERTICAL-ALIGN: super">th</font>
Floor)</font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">New York,
New York 10022</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Lexicon
Pharmaceuticals, Inc.</font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">8800
Technology Forest Place</font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
Woodlands, Texas 77381</font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Attn:&#160;
President and Chief Executive Officer</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Ladies
and Gentlemen:</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>Reference is made to that certain
Securities Purchase Agreement, dated as of June 17, 2007 (as amended, the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Securities Purchase
Agreement</font>&#8221;), by and between Invus, L.P. (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Investor</font>&#8221;) and
Lexicon Pharmaceuticals, Inc. (the &#8220;<font style="DISPLAY: inline; TEXT-DECORATION: underline">Company</font>&#8221;) and to that
certain Amendment to Securities Purchase Agreement, dated as of October [__],
2009, by and between the Investor and the Company.&#160;&#160;Capitalized terms
used but not otherwise defined herein shall have the meanings ascribed to them
in the Securities Purchase Agreement.</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>Pursuant to Section 6.02(a) of the
Securities Purchase Agreement, the Investor hereby consents to an underwritten
offering by the Company of Company Common Stock on the following
terms:</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; TEXT-DECORATION: underline">Issuer</font>: Lexicon
Pharmaceuticals, Inc.</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; TEXT-DECORATION: underline">Offering</font>: _____
shares of Company Common Stock (the &#8220;Firm Shares&#8221;), and up to
_________additional shares to cover over allotments by the underwriters in such
offering as provided in the underwriting agreement to be executed in connection
with such offering (the &#8220;Underwriting Agreement&#8221;)</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; TEXT-DECORATION: underline">Size</font>: $_____ at a
$_____ per share purchase price to the public.</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; TEXT-DECORATION: underline">Timing</font>: pricing to
occur on or before _____, 2009 with closing within T+3 (subject to extension as
provided in the Underwriting Agreement).</font></div>
        <div style="DISPLAY: block; TEXT-INDENT: 0pt">
          <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
          <div>
            <div align="justify">
              <div align="justify">
                <div align="justify">
                  <div align="justify">
                    <div align="justify">
                      <table cellpadding="0" cellspacing="0" width="100%">
                          <tr>
                            <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                            <td colspan="2" valign="top" width="37%">
                              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-WEIGHT: normal; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">INVUS,
      L.P.</font></div>
                              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font size="2">a Bermuda limited
partnership</font></div>
                            </td>
                          </tr>
                          <tr>
                            <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                            <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                            <td valign="top" width="32%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                          </tr>
                          <tr>
                            <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                            <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                            <td valign="top" width="32%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                          </tr>
                          <tr>
                            <td valign="top" width="43%">
                              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
                            </td>
                            <td valign="top" width="5%">
                              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">By:</font></div>
                            </td>
                            <td align="justify" valign="top" width="32%" style="BORDER-BOTTOM: black 1px solid">
                              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
                            </td>
                          </tr>
                          <tr>
                            <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                            <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Name:</font></td>
                            <td valign="top" width="32%">
                              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
                            </td>
                          </tr>
                          <tr>
                            <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                            <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Title:</font></td>
                            <td valign="top" width="32%">
                              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
                            </td>
                          </tr>
                          <tr>
                            <td valign="top" width="43%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                            <td valign="top" width="5%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">&#160;
      </font></td>
                            <td valign="top" width="32%">
                              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
                            </td>
                          </tr>
                      </table>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
          <div style="DISPLAY: block; TEXT-INDENT: 0pt; TEXT-ALIGN: center"><br>9</div>
        </div>
      </div>
      <div style="DISPLAY: block; TEXT-INDENT: 0pt">&#160;</div>
    </div>
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