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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 WrdyiWrpOePqk8ze3+7rKYBUmoFKrDc6CJ8MrnbI3H0q2YrrPsLBKDLLHozRXi18
 K41XNDR6pO4Ad4YHBKF6RQ==

<SEC-DOCUMENT>0001187154-03-000003.txt : 20031215
<SEC-HEADER>0001187154-03-000003.hdr.sgml : 20031215
<ACCEPTANCE-DATETIME>20031215190510
ACCESSION NUMBER:		0001187154-03-000003
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20031212
FILED AS OF DATE:		20031215

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CEPHALON INC
		CENTRAL INDEX KEY:			0000873364
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				232484489
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		145 BRANDYWINE PKWY
		CITY:			WEST CHESTER
		STATE:			PA
		ZIP:			19380
		BUSINESS PHONE:		6103440200

	MAIL ADDRESS:	
		STREET 1:		145 BRANDYWINE PARKWAY
		CITY:			WEST CHESTER
		STATE:			PA
		ZIP:			19380

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BALDINO FRANK JR
		CENTRAL INDEX KEY:			0001187154

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-19119
		FILM NUMBER:		031055816

	BUSINESS ADDRESS:	
		STREET 1:		145 BRANDYWINE PARKWAY
		CITY:			WEST CHESTER
		STATE:			PA
		ZIP:			19380
		BUSINESS PHONE:		6103440200

	MAIL ADDRESS:	
		STREET 1:		C/O VIROPHARMA INC
		STREET 2:		405 EAGLEVIEW BLVD
		CITY:			EXTON
		STATE:			PA
		ZIP:			19341
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>

<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2003-12-12</periodOfReport>

    <dateOfOriginalSubmission>2003-12-15</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000873364</issuerCik>
        <issuerName>CEPHALON INC</issuerName>
        <issuerTradingSymbol>CEPH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001187154</rptOwnerCik>
            <rptOwnerName>BALDINO FRANK JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O VIROPHARMA INC</rptOwnerStreet1>
            <rptOwnerStreet2>405 EAGLEVIEW BLVD</rptOwnerStreet2>
            <rptOwnerCity>EXTON</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>19341</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman &amp; CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>

        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3545</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>by Trust</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>

    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The number of shares held by Dr. Baldino in his 401(k) account has not changed. This holding was inadvertently omitted from the original filing.</footnote>
    </footnotes>


    <ownerSignature>
        <signatureName>Carolyn S. Iosca, Attorney-in-Fact, For: Frank Baldino, Jr.</signatureName>
        <signatureDate>2003-12-15</signatureDate>
    </ownerSignature>

</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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