Adolor Corporation, a biopharmaceutical company, engages in the discovery, development, and commercialization of prescription pain management products. Its product includes ENTEREG (alvimopan), a small molecule peripherally-acting mu-opioid receptor antagonist designed to block the adverse side effects of opioid analgesics on the gastrointestinal (GI) tract, as well as to accelerate upper and lower GI recovery following partial bowel resection surgery with primary anastomosis. The company also has various product candidates in clinical development, which include two delta opioid receptor agonist compounds, ADL5859 and ADL5747, under Phase IIa clinical trial in collaboration with Pfizer Inc. for the treatment of pain; and two opioid receptor antagonists, ADL7445 and ADL5945, which are entering into Phase II clinical trial to treat opioid bowel dysfunction, as well as other product candidates in preclinical development for treating moderate-to-severe pain and other central nervous system conditions. Adolor Corporation was founded in 1993 and is headquartered in Exton, Pennsylvania.