Unigene Laboratories (UGNE) 10-Q 2004 Q1 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 Unigene Laboratories, Inc. (the “Company”) on Form 10-Q for the period ending March 31, 2004 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Warren P. Levy, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002, 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 position and results of operations of the Company.

/s/ Warren P. Levy

Warren P. Levy

Chief Executive Officer

May 17, 2004

A signed original of this written statement required by Section 906 has been provided to Unigene Laboratories, Inc. and will be retained by Unigene Laboratories, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.