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Press Release

POZEN Hits All Primary Endpoints in Second Phase III Pivotal Trial for Trexima; NDA Submission Scheduled for 3Q 2005

CHAPEL HILL, N.C.--(BUSINESS WIRE)--April 21, 2005--POZEN Inc. (NASDAQ: POZN), announced today that it achieved statistical significance for all regulatory endpoints for Trexima in the second of the two Phase III pivotal trials. Trexima(TM) is GlaxoSmithKline's (GSK) proposed brand name for the combination of sumatriptan formulated with RT Technology(TM) and naproxen sodium in a single tablet. GSK and POZEN are collaborating on the development of Trexima.

POZEN also announced that it has met with the FDA and discussed the results of both Phase III trials and other information required for the submission of the Trexima NDA. Based upon discussions at the pre-NDA meeting, POZEN believes that no additional pre-clinical or clinical trials are necessary for submission. The Trexima NDA submission is now scheduled for the third quarter of 2005.

In the second Phase III study, Trexima demonstrated superiority over the individual components on the primary endpoint and also met all the regulatory endpoints for a new migraine product. For the combination, Trexima demonstrated a superior sustained pain-free response versus naproxen (p<0.001) and versus sumatriptan (p=0.009). With respect to pain relief and the associated symptoms of nausea, photophobia, and phonophobia, Trexima was superior to placebo at 2 hours for all parameters (p=0.007 for nausea, p<0.001 for the others).

"We are obviously very pleased with the pre-NDA meeting resulting in our ability to submit the Trexima NDA early in the second half of this year," said Dr. John R. Plachetka, Chairman, President and CEO. "The team has done a remarkable job in completing the two pivotal studies in less than a year from start to finish."

About POZEN

POZEN is a pharmaceutical company committed to developing therapeutic advancements for diseases with unmet medical needs where it can improve efficacy, safety, and/or patient convenience. Since its inception, POZEN has focused its efforts primarily on the development of pharmaceutical products for the treatment of migraine. POZEN is also exploring the development of product candidates in other pain-related therapeutic areas. POZEN has development and commercial alliances with GlaxoSmithKline, Xcel Pharmaceuticals, and Nycomed. The company's common stock is traded on The Nasdaq Stock Market under the symbol "POZN". For detailed company information, including copies of this and other press releases, see POZEN's website: www.pozen.com.

Statements included in this press release that are not historical in nature are "forward-looking statements" within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. You should be aware that our actual results could differ materially from those contained in the forward-looking statements, which are based on management's current expectations and are subject to a number of risks and uncertainties, including, but not limited to, our failure to successfully commercialize our product candidates; costs and delays in the development and/or FDA approval of our product candidates, including as a result of the need to conduct additional studies, or the failure to obtain such approval of our product candidates, including as a result of changes in regulatory standards or the regulatory environment during the development period of any of our product candidates; uncertainties in clinical trial results or the timing of such trials, resulting in, among other things, an extension in the period over which we recognize deferred revenue or our failure to achieve milestones that would have provided us with revenue; our inability to maintain or enter into, and the risks resulting from our dependence upon, collaboration or contractual arrangements necessary for the development, manufacture, commercialization, marketing, sales and distribution of any products; competitive factors; our inability to protect our patents or proprietary rights and obtain necessary rights to third party patents and intellectual property to operate our business; our inability to operate our business without infringing the patents and proprietary rights of others; general economic conditions; the failure of any products to gain market acceptance; our inability to obtain any additional required financing; technological changes; government regulation; changes in industry practice; and one-time events, including those discussed herein and in our annual report on Form 10-K for the year ended December 31, 2004 under "Management's Discussion and Analysis of Financial Condition and Results of Operations." We do not intend to update any of these factors or to publicly announce the results of any revisions to these forward-looking statements.

CONTACT:
POZEN Inc.
Bill Hodges, 919-913-1030
Chief Financial Officer
or
Fran Barsky, 919-913-1044
Director, Investor Relations

SOURCE: POZEN Inc.