-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001024780-04-000003.txt : 20040507
<SEC-HEADER>0001024780-04-000003.hdr.sgml : 20040507
<ACCEPTANCE-DATETIME>20040507164245
ACCESSION NUMBER:		0001024780-04-000003
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040505
FILED AS OF DATE:		20040507

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FLEMING US DISCOVERY PARTNERS LP
		CENTRAL INDEX KEY:			0001271982
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-27354
		FILM NUMBER:		04789668

	MAIL ADDRESS:	
		STREET 1:		C/O JP MORGAN PARTNERS
		STREET 2:		1221 AVENUE OF THE AMERICAS
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10020

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FLEMING US DISCOVERY OFFSHORE FUND III L P
		CENTRAL INDEX KEY:			0001236298
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-27354
		FILM NUMBER:		04789669

	MAIL ADDRESS:	
		STREET 1:		1221 AVENUE OF THE AMERICAS
		STREET 2:		40TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10020

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FLEMING US DISCOVERY LLC
		CENTRAL INDEX KEY:			0001271725

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-27354
		FILM NUMBER:		04789667

	MAIL ADDRESS:	
		STREET 1:		1221 AVE OF THE AMERICAS 40TH FL
		STREET 2:		C/O JP MORGAN PARTNERS
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10020

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FLEMING US DISCOVERY FUND III LP
		CENTRAL INDEX KEY:			0001024780
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-27354
		FILM NUMBER:		04789670

	BUSINESS ADDRESS:	
		STREET 1:		320 PARK AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

	MAIL ADDRESS:	
		STREET 1:		1221 AVENUE OF THE AMERICAS
		STREET 2:		40TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10020

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			IMPAX LABORATORIES INC
		CENTRAL INDEX KEY:			0001003642
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				650403311
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		30831 HAYWARD AVE
		CITY:			HAYWARD
		STATE:			CA
		ZIP:			94544
		BUSINESS PHONE:		2152892220

	MAIL ADDRESS:	
		STREET 1:		CASTOR & KENSINGTON AVENUES
		CITY:			PHILADELPHIA
		STATE:			PA
		ZIP:			19124-5694

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GLOBAL PHARMACEUTICAL CORP \DE\
		DATE OF NAME CHANGE:	19951117

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			J P MORGAN CHASE & CO
		CENTRAL INDEX KEY:			0000019617
		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-27354
		FILM NUMBER:		04789665

	BUSINESS ADDRESS:	
		STREET 1:		270 PARK AVE
		STREET 2:		39TH FL
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017
		BUSINESS PHONE:		2122706000

	MAIL ADDRESS:	
		STREET 1:		270 PARK AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017

	FORMER NAME:	
		FORMER CONFORMED NAME:	CHASE MANHATTAN CORP /DE/
		DATE OF NAME CHANGE:	19960402

	FORMER NAME:	
		FORMER CONFORMED NAME:	CHEMICAL BANKING CORP
		DATE OF NAME CHANGE:	19920703

	FORMER NAME:	
		FORMER CONFORMED NAME:	CHEMICAL NEW YORK CORP
		DATE OF NAME CHANGE:	19880508

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			JPMP CAPITAL CORP
		CENTRAL INDEX KEY:			0001243236
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-27354
		FILM NUMBER:		04789666

	BUSINESS ADDRESS:	
		STREET 1:		C/O J.P. MORGAN PARTNERS, LLC
		STREET 2:		1221 AVENUE OF THE AMERICAS 40TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10020
		BUSINESS PHONE:		212 899-3400

	MAIL ADDRESS:	
		STREET 1:		C/O JPMORGAN PARTNERS
		STREET 2:		1221 AVENUE OF THE AMERICAS 40TH FL.
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10020

	FORMER NAME:	
		FORMER CONFORMED NAME:	JPMP CAPITAL LLC
		DATE OF NAME CHANGE:	20030618
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-05-05</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001003642</issuerCik>
        <issuerName>IMPAX LABORATORIES INC</issuerName>
        <issuerTradingSymbol>IPXL</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001024780</rptOwnerCik>
            <rptOwnerName>FLEMING US DISCOVERY FUND III LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1221 AVENUE OF THE AMERICAS</rptOwnerStreet1>
            <rptOwnerStreet2>40TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10020</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001236298</rptOwnerCik>
            <rptOwnerName>FLEMING US DISCOVERY OFFSHORE FUND III L P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1221 AVENUE OF THE AMERICAS</rptOwnerStreet1>
            <rptOwnerStreet2>40TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10020</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001271982</rptOwnerCik>
            <rptOwnerName>FLEMING US DISCOVERY PARTNERS LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O JP MORGAN PARTNERS</rptOwnerStreet1>
            <rptOwnerStreet2>1221 AVENUE OF THE AMERICAS</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10020</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001271725</rptOwnerCik>
            <rptOwnerName>FLEMING US DISCOVERY LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1221 AVE OF THE AMERICAS 40TH FL</rptOwnerStreet1>
            <rptOwnerStreet2>C/O JP MORGAN PARTNERS</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10020</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001243236</rptOwnerCik>
            <rptOwnerName>JPMP CAPITAL CORP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O JPMORGAN PARTNERS</rptOwnerStreet1>
            <rptOwnerStreet2>1221 AVENUE OF THE AMERICAS 40TH FL.</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10020</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000019617</rptOwnerCik>
            <rptOwnerName>J P MORGAN CHASE &amp; CO</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>270 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10017</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2004-05-05</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5922398</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>263839</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">(a) Fleming US Discovery Fund III, L.P. (&quot;US Fund&quot;) made a distribution of 5,104,079 shares of the Issuer's common stock, $.01 par value per share (&quot;Common Stock&quot;), pro rata to its limited and general partners, and (b) Fleming US Discovery Offshore Fund III, L.P. (&quot;Offshore Fund&quot;) made a distribution of 818,319 shares of Common Stock pro rata to its limited and general partners.  Fleming US Discovery Partners, L.P. (&quot;Discovery Partners&quot;) received 233,409 shares of Common Stock as general partner of the US Fund and 30,430 shares of Common Stock as general partner of the Offshore Fund.</footnote>
        <footnote id="F2">The amounts shown represent the direct beneficial ownership of the Issuer's equity securities by Discovery Partners.  The US Fund and the Offshore Fund do not directly own any shares of the Issuer's Common Stock.  In addition, the other reporting owners on this Form 4 have an indirect beneficial ownership interest (which is described in footnotes 3, 4, 5 and 6 below).  The US Fund, as the Designated Reporter, is executing this report on behalf of all reporting owners, each of whom has authorized it to do so.  Each of such persons disclaims beneficial ownership of the securities to the extent it exceeds such person's pecuniary interest therein.</footnote>
        <footnote id="F3">The amounts shown in Table I and II represent the beneficial ownership of the Issuer's equity securities by Discovery Partners which may be attributable to the US Fund and the Offshore Fund because Discovery Partners is the general partner of the US Fund and the Offshore Fund.  The actual pro rata portion of such beneficial ownership that may be deemed attributable to the US Fund and the Offshore Fund is not readily determinable because it is subject to several variables, including the internal rate of return and vesting of interests within the US Fund and the Offshore Fund.</footnote>
        <footnote id="F4">The amounts shown in Table I and II represent the beneficial ownership of the Issuer's equity securities by Discovery Partners a portion of which may be deemed attributable to Fleming US Dicovery, LLC (&quot;Discovery, LLC&quot;) because Discovery, LLC is the general partner of Discovery Partners.  Discovery Partners is the general partner of the US Fund and the Offshore Fund.  The actual pro rata portion of such beneficial ownership that may be deemed attributable to Discovery, LLC is not readily determinable because it is subject to several variables, including the internal rate of return and vesting of interests within Discovery Partners, the US Fund and the Offshore Fund.</footnote>
        <footnote id="F5">The amounts shown in Table I and II represent the beneficial ownership of the Issuer's equity securities by Discovery Partners, a portion of which may be deemed attributable to JPMP Capital Corp. because JPMP Capital Corp. is the controlling member of Discovery, LLC.  Discovery, LLC is the general partner of Discovery Partners.  Discovery Partners is the general partner of the US Fund and the Offshore Fund.  The actual pro rata portion of such beneficial ownership that may be deemed attributable to JPMP Capital Corp. is not readily determinable because it is subject to several variables, including the internal rate of return and vesting of interests within Discovery, LLC, Discovery Partners, the US Fund and the Offshore Fund.  Designees of JPMP Capital Corp. on the Board of Managers of Discovery, LLC have voting and dispositive power over the securities shown in Table I and Table II, but no pecuniary interest.</footnote>
        <footnote id="F6">The amounts shown in Table I and II represent the beneficial ownership of the Issuer's equity securities by Discovery Partners, a portion of which may be deemed attributable to J.P. Morgan Chase &amp; Co. because J.P. Morgan Chase &amp; Co. is the sole stockholder of JPMP Capital Corp.  JPMP Capital Corp. is the controlling member of Discovery, LLC.  Discovery, LLC is the general partner of Discovery Partners.  Discovery Partners is the general partner of the US Fund and the Offshore Fund.  The actual pro rata portion of such beneficial ownership that may be deemed attributable to J.P. Morgan Chase &amp; Co. is not readily determinable because it is subject to several variables, including the internal rate of return and vesting of interests within Discovery, LLC, Discovery Partners, the US Fund and the Offshore Fund.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Fleming US Discovery Fund III, L.P., By Fleming US Dicovery Partners, L.P., its general partner, By Fleming US Discovery, LLC, its gerneral partner, By Richard D. Waters, Jr., Manager</signatureName>
        <signatureDate>2004-05-07</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Fleming US Discovery Offshore Fund III, L.P., By Fleming US Dicovery Partners, L.P., its general partner, By Fleming US Discovery, LLC, its gerneral partner, By Richard D. Waters, Jr., Manager</signatureName>
        <signatureDate>2004-05-07</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Fleming US Dicovery Partners, L.P., By Fleming US Discovery, LLC, its gerneral partner, By Richard D. Waters, Jr., Manager</signatureName>
        <signatureDate>2004-05-07</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Fleming US Discovery, LLC, By Richard D. Waters, Jr., Manager</signatureName>
        <signatureDate>2004-05-07</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>JPMP Capital Corp., By Richard D. Waters, Jr., Managing Director</signatureName>
        <signatureDate>2004-05-07</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>J.P. Morgan Chase &amp; Co., By Anthony J. Horan, Corporate Secretary</signatureName>
        <signatureDate>2004-05-07</signatureDate>
    </ownerSignature>
</ownershipDocument>

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-----END PRIVACY-ENHANCED MESSAGE-----
