<SUBMISSION>
<SECRELEASE-DATETIME>		19990305-143626	 ⇐ Metadata from SEC Info (ET)
<SECWEBSITE-DATETIME>		19990305-143626	 ⇐ Metadata from SEC Info (ET)
<ACCESSION-NUMBER>		0001036050-99-000414
<TYPE>				10-K405
<PUBLIC-DOCUMENT-COUNT>		15
<PERIOD>			19981231
<FILING-DATE>			19990304

<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>		CEPHALON INC
<CIK>				0000873364
<ASSIGNED-SIC>			2834
<IRS-NUMBER>			232484489  ⇒ 23-2484489 or 232-48-4489
<STATE-OF-INCORPORATION>	DE
<FISCAL-YEAR-END>		1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>			10-K405
<ACT>				34
<FILE-NUMBER>			000-19119
<FILM-NUMBER>			99557201
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>			145 BRANDYWINE PKWY
<CITY>				WEST CHESTER
<STATE>				PA
<ZIP>				19380
<PHONE>				2153440200
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>			145 BRANDYWINE PARKWAY
<CITY>				WEST CHESTER
<STATE>				PA
<ZIP>				19380
</MAIL-ADDRESS>
</FILER>

<DOCUMENT>
<TYPE>		10-K405
<SEQUENCE>	1
<DESCRIPTION>	FORM 10-K405
<TEXT>
       Show <TEXT>: 4,187 lines (widest: 132 characters) - 239K bytes  
</TEXT>
</DOCUMENT>

<DOCUMENT>
<TYPE>		EX-4.3(A)
<SEQUENCE>	2
<DESCRIPTION>	FORM OF NOTE PURCHASE AGREEMENT DATED 02/24/99
<TEXT>
       Show <TEXT>: 2,326 lines (widest: 80 characters) - 133K bytes  
</TEXT>
</DOCUMENT>

<DOCUMENT>
<TYPE>		EX-4.3(B)
<SEQUENCE>	3
<DESCRIPTION>	FORM OF REVENUE SHARING SENIOR SECURED NOTE
<TEXT>
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</TEXT>
</DOCUMENT>

<DOCUMENT>
<TYPE>		EX-4.3(C)
<SEQUENCE>	4
<DESCRIPTION>	FORM OF CLASS A WARRANT
<TEXT>
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</TEXT>
</DOCUMENT>

<DOCUMENT>
<TYPE>		EX-4.3(D)
<SEQUENCE>	5
<DESCRIPTION>	FORM OF CLASS B WARRANT
<TEXT>
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</TEXT>
</DOCUMENT>

<DOCUMENT>
<TYPE>		EX-4.3(E)
<SEQUENCE>	6
<DESCRIPTION>	SECURITY AGREEMENT DATED 03/01/99
<TEXT>
       Show <TEXT>: 1,124 lines (widest: 80 characters) - 64K bytes  
</TEXT>
</DOCUMENT>

<DOCUMENT>
<TYPE>		EX-4.3(F)
<SEQUENCE>	7
<DESCRIPTION>	PATENT AND TRADEMARK AGREEMENT DATED 03/01/99
<TEXT>
       Show <TEXT>: 1,336 lines (widest: 115 characters) - 74K bytes  
</TEXT>
</DOCUMENT>

<DOCUMENT>
<TYPE>		EX-10.5(H)
<SEQUENCE>	8
<DESCRIPTION>	AMENDMENT NO.5 TO LICENSE AGREEMENT
<TEXT>
       Show <TEXT>: 150 lines (widest: 80 characters) - 9K bytes  
</TEXT>
</DOCUMENT>

<DOCUMENT>
<TYPE>		EX-10.5(I)
<SEQUENCE>	9
<DESCRIPTION>	AMENDMENT NO.6 TO LICENSE AGREEMENT
<TEXT>
       Show <TEXT>: 144 lines (widest: 80 characters) - 7K bytes  
</TEXT>
</DOCUMENT>

<DOCUMENT>
<TYPE>		EX-10.5(J)
<SEQUENCE>	10
<DESCRIPTION>	AMENDMENT NO.3 TO TRADEMARK AGREEMENT
<TEXT>
       Show <TEXT>: 51 lines (widest: 80 characters) - 3K bytes  
</TEXT>
</DOCUMENT>

<DOCUMENT>
<TYPE>		EX-10.5(K)
<SEQUENCE>	11
<DESCRIPTION>	AMENDMENT NO.4 TO TRADEMARK AGREEMENT
<TEXT>
       Show <TEXT>: 72 lines (widest: 80 characters) - 3K bytes  
</TEXT>
</DOCUMENT>

<DOCUMENT>
<TYPE>		EX-10.12
<SEQUENCE>	12
<DESCRIPTION>	TOLL MFG. AND PACKAGING AGREEMENT
<TEXT>
       Show <TEXT>: 1,501 lines (widest: 129 characters) - 77K bytes  
</TEXT>
</DOCUMENT>

<DOCUMENT>
<TYPE>		EX-21
<SEQUENCE>	13
<DESCRIPTION>	SUBSIDIARIES OF CEPHALON, INC.
<TEXT>
       Show <TEXT>: 17 lines (widest: 108 characters) - 1K bytes  
</TEXT>
</DOCUMENT>

<DOCUMENT>
<TYPE>		EX-23.1
<SEQUENCE>	14
<DESCRIPTION>	CONSENT OF ARTHUR ANDERSEN
<TEXT>
       Show <TEXT>: 14 lines (widest: 80 characters) - 552 bytes  
</TEXT>
</DOCUMENT>

<DOCUMENT>
<TYPE>		EX-27
<SEQUENCE>	15
<DESCRIPTION>	FINANCIAL DATA SCHEDULE
<TEXT>
       Show <TEXT>: 50 lines (widest: 77 characters) - 3K bytes  
</TEXT>
</DOCUMENT>

</SUBMISSION>