Pfizer Incorporated is a pharmaceutical company, ranking number one in sales in the world. The company is based in New York City, with its research headquarters in Groton, Connecticut.

It produces Lipitor, the neuropathic pain/fibromyalgia drug Lyrica; the oral antifungal medication Diflucan, the antibiotic Zithromax, Viagra for erectile dysfunction, and the anti-inflammatory Celebrex.
Pfizer’s shares were made a component of the Dow Jones Industrial Average on April 8, 2004.