|  | |
|   Entrance to Pfizer headquarters | |
| Public | |
| Traded as | |
| Industry | Pharmaceutical | 
| Founded | 1849 | 
| Founders | Charles Pfizer Charles F. Erhart | 
| Headquarters | New York City, United States | 
| Area served | Worldwide | 
| Key people | Ian Read (Chairman & CEO) | 
| Products | See list | 
| Revenue |  US$48.85 billion (2015) | 
|  US$11.05 billion (2015) | |
|  US$7.74 billion (2015) | |
| Total assets |  US$169.3 billion (2015) | 
| Total equity |  US$71.30 billion (2015) | 
| Number of employees | 78,300 (2015) | 
| Subsidiaries | Agouron Pharmaceuticals G.D. Searle Greenstone Hospira InnoPharma Parke-Davis Pfizer UK | 
| Website | www | 
Pfizer Inc. /ˈfaɪzər/ is an American global pharmaceutical corporation headquartered in New York City, with its research headquarters in Groton, Connecticut. It is among the world's largest pharmaceutical companies. Pfizer is listed on the , and its shares have been a component of the Dow Jones Industrial Average since 2004.
Pfizer develops and produces medicines and vaccines for a wide range of medical disciplines, including immunology, oncology, cardiology, diabetology/endocrinology, and neurology. Pfizer's products include the blockbuster drug Lipitor (atorvastatin), used to lower LDL blood cholesterol; Lyrica (pregabalin) for neuropathic pain/fibromyalgia; Diflucan (fluconazole), an oral antifungal medication; Zithromax (azithromycin), an antibiotic; Viagra (sildenafil) for erectile dysfunction; and Celebrex/Celebra (celecoxib), an anti-inflammatory drug.
Pfizer was founded in 1849 by cousins Charles Pfizer and Charles F. Erhart in New York City as a manufacturer of fine chemicals. Its discovery of Terramycin (oxytetracycline) in 1950 put it on a path towards becoming a research-based pharmaceutical company. Pfizer has made numerous acquisitions, including Warner–Lambert in 2000, Pharmacia in 2003, and Wyeth in 2009 (the largest of the three at $68 billion).