SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D. C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED): MAY 26, 2004 HALSEY DRUG CO., INC. 616 N. NORTH COURT, SUITE 120, PALATINE, ILLINOIS 60067 (847-705-7709) Incorporated under the laws of Commission File Number I.R.S. Employer Identification Number State of New York 1-10113 11-0853640 ITEM 5. OTHER EVENTS On May 26, 2004, Halsey Drug Co., Inc. (the "Company") issued a press release disclosing the filing of four non-provisional patent applications with the US Patent and Trademark Office relating to the Company's opioid synthesis technologies. A copy of the Company's press release is attached as Exhibit 99.1 hereto. ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS. (B) EXHIBITS EXHIBIT NUMBER DESCRIPTION ------ ----------- 99.1 Press Release of Halsey Drug Co., Inc. dated May 26, 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 thereunto duly authorized. HALSEY DRUG CO., INC. By: /s/ Peter A. Clemens ------------------------------------- Peter A. Clemens Senior Vice President & Chief Financial Officer Date: May 26, 2004 3 EXHIBIT INDEX EXHIBIT NUMBER DESCRIPTION 99.1 Press Release dated May 26, 2004. 4