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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001104659-10-058967.txt : 20101118
<SEC-HEADER>0001104659-10-058967.hdr.sgml : 20101118
<ACCEPTANCE-DATETIME>20101117190923
ACCESSION NUMBER:		0001104659-10-058967
CONFORMED SUBMISSION TYPE:	RW
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20101118
DATE AS OF CHANGE:		20101117

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Amphastar Pharmaceuticals, Inc.
		CENTRAL INDEX KEY:			0001297184
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				330702205

	FILING VALUES:
		FORM TYPE:		RW
		SEC ACT:		
		SEC FILE NUMBER:	333-122725
		FILM NUMBER:		101200911

	BUSINESS ADDRESS:	
		STREET 1:		11570 SIXTH STREET
		CITY:			RANCHO CUCAMONGA
		STATE:			CA
		ZIP:			91730
		BUSINESS PHONE:		909-980-9484

	MAIL ADDRESS:	
		STREET 1:		11570 SIXTH STREET
		CITY:			RANCHO CUCAMONGA
		STATE:			CA
		ZIP:			91730
</SEC-HEADER>
<DOCUMENT>
<TYPE>RW
<SEQUENCE>1
<FILENAME>a10-21408_1rw.htm
<DESCRIPTION>RW
<TEXT>

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</head>

<body lang="EN-US">

<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Amphastar Pharmaceuticals, Inc. Letterhead)</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">November&nbsp;15,
2010</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><b><u><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">VIA EDGAR TRANSMISSION</font></u></b></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Securities
and Exchange Commission</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">100
F. Street, N.E.</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Washington
D.C. 20549</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt .5in;text-align:justify;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Re:</font><font size="1" style="font-size:3.0pt;">&#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><font size="2" style="font-size:10.0pt;">Request for Withdrawal of
Registration Statement on Form&nbsp;S-1, File No.: 333-122725, Filed February&nbsp;11,
2005</font></p>

<p style="margin:0in 0in .0001pt .5in;text-align:justify;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Ladies
and Gentlemen:</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant
to Rule&nbsp;477 promulgated under the Securities Act of 1933, as amended (the &#147;<u>Securities
Act</u>&#148;), Amphastar Pharmaceuticals,&nbsp;Inc. (the &#147;<u>Registrant</u>&#148;)
hereby respectfully requests that the U.S. Securities and Exchange Commission
(the &#147;<u>Commission</u>&#148;) consent to the withdrawal of the Registrant&#146;s
Registration Statement on Form&nbsp;S-1 (File No.&nbsp;333-122725), together
with all exhibits and amendments thereto (the &#147;<u>Registration Statement</u>&#148;),
effective as of the date hereof.&#160; The
Registration Statement was initially filed with the Commission on February&nbsp;11,
2005.</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The
Registrant is withdrawing the Registration Statement as it is not pursuing an
initial public offering at this time.&#160;
The Registrant confirms that the Commission did not declare the
Registration Statement effective, and no securities have been distributed,
issued or sold pursuant to the Registration Statement.</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The
Registrant acknowledges that no refund will be made for fees paid to the
Commission in connection with the filing of the Registration Statement.&#160; However, the Registrant requests, in
accordance with Rule&nbsp;457(p)&nbsp;under the Securities Act that all fees
paid to the Commission in connection with the filing of the Registration
Statement be credited to the Registrant&#146;s account to be offset against the
filing fee for the filing of any future registration statement or registration
statements.</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">If
you have any questions or require further information or documentation
regarding the foregoing, please do not hesitate to contact the undersigned at
1-800-423-4136, ext. 2021.&#160; Please
forward a copy of the order withdrawing the Registration Statement to the
undersigned at the address set forth in the letterhead above.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Thank
you for your assistance.</font></p>

<p style="margin:0in 0in .0001pt;text-align:justify;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="47%" valign="top" style="padding:0in 0in 0in 0in;width:47.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="52%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:52.74%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Very
  truly yours,</font></p>
  </td>
 </tr>
 <tr>
  <td width="47%" valign="top" style="padding:0in 0in 0in 0in;width:47.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="52%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:52.74%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="47%" valign="top" style="padding:0in 0in 0in 0in;width:47.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="52%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:52.74%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amphastar
  Pharmaceuticals,&nbsp;Inc.</font></p>
  </td>
 </tr>
 <tr>
  <td width="47%" valign="top" style="padding:0in 0in 0in 0in;width:47.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="52%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:52.74%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="47%" valign="top" style="padding:0in 0in 0in 0in;width:47.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="52%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:52.74%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="47%" valign="top" style="padding:0in 0in 0in 0in;width:47.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="46%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:46.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/
  John Weber</font></p>
  </td>
 </tr>
 <tr>
  <td width="47%" valign="top" style="padding:0in 0in 0in 0in;width:47.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font></p>
  </td>
  <td width="46%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:46.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">John
  Weber</font></p>
  </td>
 </tr>
 <tr>
  <td width="47%" valign="top" style="padding:0in 0in 0in 0in;width:47.26%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.08%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title:</font></p>
  </td>
  <td width="46%" valign="top" style="padding:0in 0in 0in 0in;width:46.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chief
  Financial Officer</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

</div>
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