Calusterone (INN, USAN) (brand names Methosarb, Riedemil; former developmental code names NSC-88536, U-22550), also known as 7ò,17ñ-dimethyltestosterone, is an orally active anabolic-androgenic steroid (AAS) that is used as an antineoplastic agent. It is a 17ñ-alkylated AAS similar in structure to bolasterone (which is its 7ñ-isomer).
Calusterone is on the World Anti-Doping Agency's list of prohibited substances, and is therefore banned from use in most major sports.