Gilead Sciences, Inc., a biopharmaceutical company, discovers, develops, and commercializes medicines in areas of unmet medical need in North America, South America, Europe, and the Asia-Pacific. The company’s products include Stribild, Complera/Eviplera, Atripla, Truvada, Viread, Emtriva, Tybost, and Vitekta for the treatment of human immunodeficiency virus (HIV) infection in adults; and Harvoni, Sovaldi, Viread, and Hepsera products for the treatment of liver disease. It also offers Zydelig, a PI3K delta inhibitor, in combination with rituximab, for the treatment of certain blood cancers; 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; and Macugen, an anti-angiogenic oligonucleotide to treat neovascular age-related macular degeneration. Further, it has product candidates in various stages of development for the treatment of HIV/AIDS and liver diseases, such as hepatitis B virus and hepatitis C virus; inflammation/oncology; serious cardiovascular; and respiratory conditions. The company markets its products through its commercial teams and/or in conjunction with third-party distributors and corporate partners. Gilead Sciences, Inc. has a strategic partnership with WuXi PharmaTech (Cayman) Inc.; collaborations with Bristol-Myers Squibb Company', Janssen R&D Ireland, Japan Tobacco Inc., and Galapagos; and a partnership with Gilead Sciences Inc. The company was founded in 1987 and is headquartered in Foster City, California.