Flex Pharma, Inc. operates as a clinical-stage biotechnology company. It operates through the Consumer Operations and Drug Development segments. The Consumer Operations segment includes HOTSHOT product and consumer operations. The Drug Development segment engages in the development of innovative and proprietary drug products to treat muscle cramps and spasms associated with severe neurological conditions. The company was founded by Rod MacKinnon, Bruce Bean, Christoph Westphal, Rich Aldrich, Michelle Dipp, and Jennifer M. Cermak in February 2014 and is headquartered in Boston, MA.