Arena Pharmaceuticals, Inc. to Report First Quarter 2007 Financial Results and to Host Conference Call and Webcast on Wednesday, April 18, 2007

SAN DIEGO, April 11 /PRNewswire-FirstCall/ -- Arena Pharmaceuticals, Inc. today announced it will report first quarter 2007 financial results after the NASDAQ Global Market closes on Wednesday, April 18, 2007. That same afternoon, Jack Lief, Arena’s President and Chief Executive Officer, and Robert E. Hoffman, Arena’s Vice President, Finance and Chief Financial Officer, will host a conference call at 5:00 p.m. Eastern Time (2:00 p.m. Pacific Time) to discuss the financial results for the first quarter 2007 and to provide a corporate update.

The conference call may be accessed by dialing 866.383.7989 for domestic callers and 617.597.5328 for international callers. Please specify to the operator that you would like to join the “Arena First Quarter Earnings Call.” The conference call will be webcast live under the investor relations section of Arena’s website at http://www.arenapharm.com, and will be archived there for 30 days following the call. 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.

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 E. Blair Schoeb President and CEO WeissComm Partners Media Relations David Walsey 760.365.1857 Director, Corporate Communications Arena Pharmaceuticals, Inc. 858.453.7200, ext. 1479

Arena Pharmaceuticals, Inc.

CONTACT: Jack Lief, President and CEO, or David Walsey, Director,Corporate Communications, +1-858-453-7200, ext. 1479, both of ArenaPharmaceuticals, Inc.; or E. Blair Schoeb, Media Relations of WeissCommPartners, +1-760-365-1857, for Arena Pharmaceuticals, Inc.

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