Pfizer() is an American pharmaceutical corporation. One of the world's largest pharmaceutical companies, it is ranked 64 on the 2020 "Fortune" 500 list of the largest United States corporations by total revenue. It was founded in 1849 in New York City. It is ranked the largest drug company in the world. The company is responsible for the first COVID-19 vaccination. Pfizer is known for its drugs Advil and ChapStick. The company bought Wyeth, which also used to be a drug company. The deal was completed in 2009. 