Optimer Pharmaceuticals to Present at Two Upcoming Investor Conferences

Optimer Pharmaceuticals, Inc. (NASDAQ:OPTR) today announced that the Company will present at the following investor conferences:

* Piper Jaffray Europe Conference on Wednesday, June 25, 2008 at 1:40 p.m. British Summer Time (6:40 a.m. Eastern Time) at the ANdAZ Hotel (formerly the Great Eastern Hotel) in London.
* Jefferies 2nd Annual Healthcare Conference on Wednesday, June 25, 2008 at 1:30 p.m. Eastern Time at the Mandarin Oriental in New York City.

Live audio webcasts of these presentations will be accessible on the Company’s website at www.optimerpharma.com, under the investors section. Replays of these presentations will be available at the same location for thirty days following 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, currently in two pivotal Phase 3 clinical trials, is being developed for the treatment of Clostridium difficile infection, the most common hospital-acquired diarrhea. Prulifloxacin, also in two pivotal Phase 3 clinical trials, is an antibiotic being developed for the treatment of travelers’ diarrhea, a form of infectious diarrhea. Additional information regarding Optimer can be found at http://www.optimerpharma.com.
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