Arena Pharmaceuticals, Inc.
May 6, 2004

Arena Pharmaceuticals to Present Corporate Update at the Rodman & Renshaw Techvest Global Healthcare Conference

SAN DIEGO, May 6 /PRNewswire-FirstCall/ -- Arena Pharmaceuticals, Inc. (Nasdaq: ARNA) announced today that Dominic Behan, Vice President, Research and co-founder of Arena, is scheduled to present a corporate update at the Rodman & Renshaw Techvest Global Healthcare Conference on Wednesday, May 12, 2004. The presentation is scheduled to take place at 1:00 PM London Time (5:00 AM Pacific Time and 8:00 AM Eastern Time) at the Claridge's Hotel in London.

To access the live audio broadcast or the subsequent archived recording, log on to http://www.arenapharm.com and go to the investor relations section. 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

Arena is a biopharmaceutical company focusing on the discovery, development and commercialization of drugs in four major therapeutic areas: metabolic, cardiovascular, central nervous system and inflammatory diseases. Arena is developing a broad pipeline of compounds including one in Phase 1 clinical trials for obesity and another in preclinical development for insomnia. The company's compounds act on an important class of drug targets called G protein-coupled receptors, or GPCRs, and were developed using Arena's proprietary technologies, including CART (Constitutively Activated Receptor Technology) and Melanophore. Arena also has research collaborations with Merck, Fujisawa, Taisho and TaiGen for products in a number of different indications. For additional information about Arena, please visit their website at http://www.arenapharm.com.

    Contact:   Jack Lief                     Susan Neath
               Arena Pharmaceuticals         Atkins + Associates
               858-453-7200, ext. 223        858-527-3486

SOURCE Arena Pharmaceuticals, Inc.
05/06/2004
CONTACT:
Jack Lief of Arena Pharmaceuticals, +1-858-453-7200, ext. 223
or
Susan Neath of Atkins Associates, +1-858-527-3486
for Arena Pharmaceuticals
Web site: http://www.arenapharm.com