Cephalon (CEPH) 10-Q 2004 Q3 Quarterly report

Exhibit 32.1

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Cephalon, Inc. (the “Company”) on Form 10-Q for the quarterly period ended September 30, 2004 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Frank Baldino, Jr., Chairman and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, based on my knowledge, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/FRANK BALDINO, JR.

Frank Baldino, Jr., Ph.D.

Chairman and Chief Executive Officer

November 9, 2004