Gilead Sciences, Inc., a biopharmaceutical company, discovers, develops, and commercializes medicines for the treatment of life threatening diseases in North America, South America, Europe, and the Asia-Pacific. The companys products include Stribild, Complera/Eviplera, Atripla, Truvada, Viread, Emtriva, Tybost, and Vitekta for the treatment of human immunodeficiency virus (HIV) infection in adults; and Sovaldi, Viread, and Hepsera products for the treatment of liver disease. It also offers Letairis, an endothelin receptor antagonist for the treatment of pulmonary arterial hypertension; Ranexa, a tablet used for the treatment of chronic angina; Lexiscan/Rapiscan injection for use as a pharmacologic stress agent in radionuclide myocardial perfusion imaging; Cayston, an inhaled antibiotic for the treatment of respiratory systems in cystic fibrosis patients; and Tamiflu, an oral antiviral capsule for the treatment and prevention of influenza A and B. In addition, the company provides other products, such as AmBisome, an antifungal agent to treat serious invasive fungal infections; Vistide, an antiviral injection for the treatment of cytomegalovirus retinitis in adult patients with AIDS; and Macugen, an anti-angiogenic oligonucleotide to treat neovascular age-related macular degeneration. Further, it has product candidates in various stages for the treatment of HIV, liver, oncology/inflammation, cardiovascular, and respiratory diseases. The company markets its products through its commercial teams and/or in conjunction with third-party distributors and corporate partners. Gilead Sciences, Inc. has collaborations with BMS, Janssen, and Japan Tobacco to develop and commercialize various products. The company was founded in 1987 and is headquartered in Foster City, California.