5. Merck & Co. (MSD)
This is an American pharmaceutical company also known as MSD outside North America. The company creates drugs, biologics, and drugs in several areas such as endocrinology, infectious disease, cardiovascular and oncology. The company also saw an increase in revenue growth from its bestselling product; Keytruda which is a drug cancer and made a total of $35.4 billion dollars. Other best selling drugs from MSD are Januvia diabetes pill and HPV Vaccine Gardasil.