UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT FILED PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED): MARCH 30, 2004 ZONAGEN, INC. (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER) DELAWARE 0-21198 76-0233274 (STATE OR OTHER JURISDICTION OF (COMMISSION FILE NUMBER) (I.R.S. EMPLOYER IDENTIFICATION NO.) INCORPORATION OR ORGANIZATION) 2408 TIMBERLOCH PLACE, SUITE B-10 THE WOODLANDS, TEXAS 77380 (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES AND ZIP CODE) (281) 719-3400 (REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE) ITEM 5. OTHER INFORMATION On March 30, 2004, Zonagen, Inc. (the "Company") announced in a press release that Dr. Ronald Wiehle, the Company's Director of R&D, presented data generated at the Company in collaboration with scientists at the University of Illinois-Chicago that indicate the potential for Progenta(TM) for the treatment of breast cancer. A copy of the Company's press release is attached hereto as Exhibit 99.1. The press release is incorporated by reference herein and the foregoing description of the press release is qualified in its entirety by reference to the attached exhibit. ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS c. Exhibits Exhibit Number Description ------- ----------- 99.1 Press Release dated March 30, 2004. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. ZONAGEN, INC. Date: April 1, 2004. By: /s/ Louis Ploth, Jr. ------------------------------------------- Louis Ploth, Jr. Vice President, Business Development and Chief Financial Officer EXHIBIT INDEX Exhibit Number Description ------- ----------- 99.1 Press Release dated March 30, 2004.