Arena Pharmaceuticals, Inc. Announces Public Offering Of Common Stock

SAN DIEGO, Jan. 17 /PRNewswire-FirstCall/ -- Arena Pharmaceuticals, Inc. today announced that it plans to publicly offer 8,500,000 shares of its common stock pursuant to an effective registration statement previously filed with the Securities and Exchange Commission. In connection with this offering, Arena plans to grant to the underwriters a 30-day option to purchase up to an additional 1,275,000 shares of common stock to cover over-allotments, if any. All of the shares are being sold by Arena. CIBC World Markets Corp. and UBS Investment Bank are acting as joint book-running managers in this offering. Needham & Company, LLC, Piper Jaffray & Co., SG Cowen & Co., LLC, Morgan Joseph & Co. Inc. and Montgomery & Co., LLC are acting as co-managers.

The securities may not be sold nor may offers to buy be accepted prior to the time that a final prospectus supplement is filed with the Securities and Exchange Commission. This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such jurisdiction. Copies of the preliminary prospectus may be obtained from CIBC World Markets Corp. by email at useprospectus@us.cibc.com or by fax at 212-667-6303, or from UBS Investment Bank, Prospectus Department, 299 Park Avenue, New York, NY 10171 or by phone at 888-827-7275.

Contacts: Jack Lief Carin Canale President and CEO Porter Novelli Life Sciences Media & Investor Relations David Walsey (858) 336-3027 Director, Corporate Communications Arena Pharmaceuticals (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 & Investor Relations, Carin Canale ofPorter Novelli Life Sciences, +1-858-336-3027, for Arena Pharmaceuticals,Inc.

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