Metoprolol tartrate is the generic name for the brand-name medication Lopressor. It is used to treat high blood pressure, chest pain, and to improve your recovery from a heart attack by relaxing blood vessels and slowing your heart rate.

Founded in 1961, Mylan Pharmaceuticals is the second largest provider in the U.S. and distributes more than 388 drugs in the country. Mylan serves 165 countries in total through its range of product offerings. The company has 40+ manufacturing sites including in the U.S., India, and Ireland.