Pfizer Inc. is an American multinational pharmaceutical corporation headquartered in New York City. It is one of the world's largest pharmaceutical companies. It is listed on the New York Stock Exchange, and its shares have been a component of the Dow Jones Industrial Average since 2004. Pfizer ranked No. 57 on the 2018 Fortune 500 list of the largest United States corporations by total revenue.
The company developed and produces medicines and vaccines for a wide range of medical disciplines, including immunology, oncology, cardiology, endocrinology, and neurology. Its products include the blockbuster drug Lipitor (atorvastatin), used to lower LDL blood cholesterol; Lyrica (pregabalin) for neuropathic pain and fibromyalgia; Diflucan (fluconazole), an oral antifungal medication; Zithromax (azithromycin), an antibiotic; Viagra (sildenafil) for erectile dysfunction; and Celebrex (also Celebra, celecoxib), an anti-inflammatory drug.