Arena Pharmaceuticals Announces First Quarter 2009 Financi...(ence May 18-19 2009 Boston Massachusetts...)

• The 8th Annual Needham Life Sciences Conference, June 10-11, 2009, New York, New York

About Arena Pharmaceuticals

Arena is a clinical-stage biopharmaceutical company focused on discovering, developing and commercializing oral drugs in four major therapeutic areas: cardiovascular, central nervous system, inflammatory and metabolic diseases. Arena's most advanced drug candidate, lorcaserin, is being investigated in a Phase 3 clinical trial program for weight management. Arena's broad pipeline of novel compounds target G protein-coupled receptors, an important class of validated drug targets, and includes compounds being evaluated independently and with partners, including Merck & Co., Inc., and Ortho-McNeil-Janssen Pharmaceuticals, Inc.

Arena Pharmaceuticals(R) and Arena(R) are registered service marks of the company. "APD" is an abbreviation for Arena Pharmaceuticals Development.

Forward-Looking Statements

Certain statements in this press release are forward-looking statements that involve a number of risks and uncertainties. Such forward-looking statements include statements about the significance of the BLOOM results; future research and development focus and plans; future activities, results and announcements relating to lorcaserin, including with regard to the BLOSSOM trial and the submission of a New Drug Application for lorcaserin; the development, therapeutic indication, tolerability, safety, selectivity, efficacy and potential of lorcaserin; the protocol, design, scope, and other aspects of the lorcaserin trials; the potential of lorcaserin to meet the FDA's requirements for approval; the impact of weight loss on health; the significance of the review of echocardiographic data and lorcaserin's effect on t
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