Arena Pharmaceuticals, Inc. To Present At The CIBC World Markets Annual Biotechnology And Specialty Pharmaceutical Conference On Wednesday, April 5, 2006

SAN DIEGO, March 31 /PRNewswire-FirstCall/ -- Arena Pharmaceuticals, Inc. announced today that it will present at the CIBC World Markets Annual Biotechnology and Specialty Pharmaceutical Conference on Wednesday, April 5, 2006, at 8:30 a.m. Eastern Time (5:30 a.m. Pacific Time) at the Millennium Broadway Hotel in New York City. Jack Lief, Arena’s President and Chief Executive Officer, will provide a corporate overview and update of Arena and its clinical development and discovery programs.

A live webcast of the presentation will be available under the investor relations section of Arena’s website at http://www.arenapharm.com. Replays of the presentation will be available for 30 days following the event. Please connect to Arena’s website several minutes prior to the start of the broadcast to ensure adequate time for any software download that may be necessary.

Arena Pharmaceuticals(R) and Arena(R) are registered service marks of the company.

Contacts: Jack Lief President and CEO David Walsey Director, Corporate Communications Arena Pharmaceuticals, Inc. 858.453.7200, ext. 1682 Media: Carin Canale Porter Novelli Life Sciences 858.527.3498

Arena Pharmaceuticals, Inc.

CONTACT: Jack Lief, President and CEO, or David Walsey, Director,Corporate Communications, both of Arena Pharmaceuticals, Inc.,+1-858-453-7200, ext. 1682; or Media, Carin Canale of Porter Novelli LifeSciences, +1-858-527-3498, for Arena Pharmaceuticals, Inc.

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