Arena Pharmaceuticals, Inc.
Oct 12, 2006

Arena Pharmaceuticals to Present at the BIO InvestorForum

SAN DIEGO, Oct. 12 /PRNewswire-FirstCall/ -- Arena Pharmaceuticals, Inc. (Nasdaq: ARNA) announced today that the company will be presenting at the BIO InvestorForum on Wednesday, October 18, 2006 at 12:20 p.m. Pacific Time (3:20 p.m. Eastern Time) at the Palace Hotel in San Francisco. Louis Scotti, Arena's Vice President, Marketing and Business Development, is scheduled to provide a corporate overview of the company and its clinical development and discovery programs.

A live audio webcast of the presentation will be available under the investor relations section of Arena's website at www.arenapharm.com. A replay of the presentation will be available for 30 days following each event. Please connect to Arena's website several minutes prior to the start of the conference call to ensure adequate time for any software download that may be necessary.

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 product candidate, lorcaserin, is being investigated in a Phase 3 clinical trial program for the treatment of obesity. Arena's broad pipeline of novel compounds targeting G protein- coupled receptors, an important class of validated drug targets, includes compounds being evaluated for other serious diseases and disorders independently and with our partners, Merck & Co., Inc. and Ortho-McNeil Pharmaceutical, Inc.

Arena Pharmaceuticals® and Arena® are registered service marks of the company. CART is an unregistered service mark 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 Arena's strategy and ability to discover and develop compounds and commercialize drugs. For such statements, Arena claims the protection of the Private Securities Litigation Reform Act of 1995. Actual events or results may differ materially from Arena's expectations. Factors that could cause actual results to differ materially from the forward-looking statements include, but are not limited to, Arena's planned clinical trials and studies may not proceed at the time or in the manner Arena expects or at all; the results of preclinical studies or clinical trials may not be predictive of future results; the timing, success and cost of Arena's research and development; Arena's ability to partner lorcaserin, APD125 or other of its compounds or programs; Arena's ability to obtain additional financing; Arena's ability to obtain and defend its patents; and the timing and receipt of payments and fees, if any, from Arena's collaborators. Additional factors that could cause actual results to differ materially from those stated or implied by Arena's forward-looking statements are disclosed in Arena's filings with the Securities and Exchange Commission. These forward-looking statements represent Arena's judgment as of the time of this release. Arena disclaims any intent or obligation to update these forward-looking statements, other than as may be required under applicable law.

SOURCE 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 Relations, Carolyn Wang of WeissComm Partners, +1-415-946-1065, for Arena Pharmaceuticals, Inc.
Web site: http://www.arenapharm.com