Arena Pharmaceuticals, Inc. to Present at Four Upcoming Investor Conferences

SAN DIEGO, Sept. 13 /PRNewswire-FirstCall/ -- Arena Pharmaceuticals, Inc. announced today that the company is scheduled to provide a corporate overview of its clinical development and discovery programs at four upcoming investor conferences:

-- ThinkEquity Partners’ 5th Annual Growth Conference Presentation: Monday, September 17, 2007 at 10:00 a.m. Pacific Time (1:00 p.m. Eastern Time) at the St. Regis Hotel in San Francisco Presenting: Jack Lief, Arena’s President and Chief Executive Officer -- Merrill Lynch Global Pharmaceutical, Biotech & Medtech Conference 2007 Presentation: Wednesday, September 19, 2007 at 11:20 a.m. British Summer Time (6:20 a.m. Eastern Time, 3:20 a.m. Pacific Time) at the Merrill Lynch Financial Centre in London Presenting: Jack Lief, Arena’s President and Chief Executive Officer -- A.G. Edwards’ Emerging Growth Conference 2007 Presentation: Wednesday, September 19, 2007 at 12:30 p.m. Eastern Time (9:30 a.m. Pacific Time) at the New York Palace Hotel in New York City Presenting: Robert E. Hoffman, Arena’s Vice President, Finance and Chief Financial Officer -- Maxim Group Growth Conference Presentation: Thursday, September 20, 2007 at 10:30 a.m. Eastern Time (7:30 a.m. Pacific Time) at the Grand Hyatt Hotel in New York City Presenting: Robert E. Hoffman, Arena’s Vice President, Finance and Chief Financial Officer

A live audio webcast of each presentation will be available under the investor relations section of Arena’s website at http://www.arenapharm.com. 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 independently and with its partners, Merck & Co., Inc. and Ortho-McNeil Pharmaceutical, 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 Arena’s strategy, preclinical and internal and partnered clinical programs, and ability to 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 may not proceed at the time Arena expects or at all, the results of preclinical studies or clinical trials may not be predictive of future results, Arena’s ability to partner lorcaserin, APD125, APD791 or other of its compounds or programs, the timing, success and cost of Arena’s research, out-licensing endeavors and clinical trials, 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.

Contacts: Jack Lief Mary Claire Duch President and CEO WeissComm Partners Media Relations David Walsey 212.301.7228 Director, Corporate Communications Arena Pharmaceuticals, Inc. 858.453.7200, ext. 1682

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, Mary Claire Duch ofWeissComm Partners, +1-212-301-7228, for Arena Pharmaceuticals, Inc.

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