Flexion Therapeutics is a specialty pharmaceutical company that focuses on the development and commercialization of anti-inflammatory and analgesic therapies for the treatment of patients with musculoskeletal conditions. Zilretta, Flexion’s lead investigational product candidate, is an extended release intra-articular, analgesic candidate in late stage development for moderate to severe osteoarthritis pain. The company was founded in 2007 and is headquartered in Burlington, Massachusetts.