Optimer Pharmaceuticals, Inc. (Nasdaq: OPTR) announced today that the Company is scheduled to present on Thursday, September 4, 2008, at 1:30 p.m. ET at the NewsMakers in the Biotech Industry Conference at the Millennium Broadway Hotel in New York, NY.

A live audio webcast of this presentation will be available on the Company’s website at www.optimerpharma.com [1], on the investors page. Replays of this presentation will be available for thirty days after the meeting.

About Optimer Pharmaceuticals

Optimer Pharmaceuticals, Inc. is a biopharmaceutical company focused on discovering, developing and commercializing innovative anti-infective products for the treatment of serious infections. Optimer has two late-stage anti-infective product candidates. OPT-80 is being developed for the treatment of Clostridium difficile infection, the most common hospital-acquired diarrhea. Prulifloxacin is an antibiotic being developed for the treatment of travelers’ diarrhea, a form of infectious diarrhea. Additional information can be found at http://www.optimerpharma.com [2].