Optimer Pharmaceuticals Reports First Quarter 2009 Financi...(al achieved the primary endpoint of medi...)

Date:5/7/2009

al achieved the primary endpoint of median Time to Last Unformed Stool (TLUS). Median TLUS for patients treated with prulifloxacin was 32.8 hours which was statistically significant compared to the TLUS for placebo with a p-value of less than 0.0001. Prulifloxacin was generally well tolerated and had a similar safety profile compared to placebo. This is the second of two pivotal Phase 3 clinical studies which will be used to support an NDA submission with the U.S. Food and Drug Administration.

Raised $32.9 million in gross proceeds through the sale of 3.3 million shares and warrants to purchase 91,533 shares in a registered direct offering in March 2009.

Appointed Francois-Xavier Frapaise, M.D., as Senior Vice President and Chief Scientific Officer and Peter E. Grebow, Ph.D., Executive Vice President of Worldwide Technical Operations at Cephalon, Inc. (Nasdaq: CEPH), to the company's Board of Directors.

Published in vitro data highlighting the antibacterial activity of prulifloxacin in the peer-reviewed journal Antimicrobial Agents and Chemotherapy.

About Optimer Pharmaceuticals

Optimer Pharmaceuticals, Inc. is a biopharmaceutical company focused on discovering, developing and commercializing innovative anti-infective products to treat serious infections and address unmet medical needs. Optimer has two late-stage anti-infective product candidates under development. Fidaxomicin, formerly known as OPT-80, is the only antibiotic therapy currently in Phase 3 worldwide clinical development for Clostridium difficile infection. Prulifloxacin is an antibiotic which has completed two Phase 3 clinical trials for the treatment of travelers' diarrhea, a form of infectious diarrhea. Additional information can be found at

SOURCE Optimer Pharmaceuticals, Inc. Copyright©2009 PR Newswire. All rights reserved

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