Arena Pharmaceuticals, Inc. is a biopharmaceutical company focused on discovering, developing and commercializing small molecule drugs that target G protein-coupled receptors (GPCRs). The Company's drug, Lorcaserin, is approved for marketing in the United States and South Korea for the indication of weight management, and is being commercialized under the brand name, BELVIQ. The Company's drug candidates in clinical development include APD334 for autoimmune diseases, ralinepag for vascular diseases and APD371 for pain. APD334 is an orally available modulator of the sphingosine 1-phosphate subtype 1 (S1P1) receptor intended for the treatment of multiple sclerosis, psoriasis, inflammatory bowel diseases and rheumatoid arthritis. The Company's programs under collaboration include nelotanserin for dementia-associated psychosis, temanogrel for thrombotic diseases and an undisclosed orphan GPCR for central nervous system indication(s).