Upjohn was a pharmaceutical company founded in 1886 by Dr. William E. Upjohn in Kalamazoo, Michigan. It became well-known for developing and manufacturing various medications, including the popular antidepressant Prozac and the muscle relaxant Soma. The company focused on innovative drug development and played a significant role in the pharmaceutical industry for over a century. In 2001, Upjohn merged with Pharmacia, which was later acquired by Pfizer in 2003. This merger allowed Upjohn to expand its reach and resources, ultimately becoming a part of one of the largest pharmaceutical companies in the world. Today, Upjohn operates as a division of Pfizer, focusing on off-patent branded and generic medications.