Salix Pharmaceuticals, Ltd. acquires, develops, and commercializes prescription drugs and medical devices to treat various gastrointestinal diseases in the United States. The company provides Xifaxan tablets to treat overt hepatic encephalopathy, and patients with travelers diarrhea; Apriso to maintain remission of ulcerative colitis (UC); Moviprep and Osmoprep for cleansing of the colon as a preparation for colonoscopy in adults; Relistor for the treatment of opioid-induced constipation (OIC) in patients with advanced illness; Solesta to treat fecal incontinence; and Deflux to treat vesicoureteral reflux. It also offers Fulyzaq for the symptomatic relief of non-infectious diarrhea in adult patients with HIV/AIDS on anti-retroviral therapy; Giazo, Colazal, and Uceris to treat mild to moderate UC; and Metozolv ODT for the treatment of refractory gastroesophageal reflux disease (GERD) that fails to respond to conventional therapy. The company s products also comprise Ruconest to treat acute attacks in adult and adolescent patients with hereditary angioedema; Azasan azathioprine tablets, which are used as adjunct to prevent rejection in renal homotransplantations and to reduce signs and symptoms of severe active rheumatoid arthritis; Anusol-HC and Proctocort for the relief of the inflammatory and pruritic manifestations of corticosteroid-responsive dermatoses; and Pepcid for the short-term treatment of GERD, active duodenal ulcer, active benign gastric ulcer, erosive esophagitis due to GERD, and peptic ulcer diseases. In addition, it provides Diuril to treat hypertension and also as adjunctive therapy; Zegerid for the treatment of upper gastrointestinal conditions; Glumetza and Cycloset to enhance glycemic control in adults with type 2 diabetes mellitus; and Fenoglide to treat lipoprotein-cholesterol, total cholesterol, triglycerides, and apolipoprotein B, as well as hypertriglyceridemia. The company was founded in 1989 and is headquartered in Raleigh, North Carolina.