WEST HARTFORD, CT--(Marketwire - September 23, 2010) - The law firm of Izard Nobel LLP, which has significant experience representing investors in prosecuting claims of securities fraud, announces that a lawsuit seeking class action status has been filed in the United States District Court for the Southern District of California on behalf of purchasers of the common stock of Arena Pharmaceuticals, Inc. ("Arena" or the "Company") (NASDAQ: ARNA) between December 8, 2008 and September 16, 2010 (the "Class Period").