Calusterone (INN, USAN) (brand names Methosarb, Riedemil; former developmental code names NSC-88536, U-22550), also known as 7β,17α-dimethyltestosterone, is an orally active anabolic-androgenic steroid (AAS) that is used as an antineoplastic agent.

[1][2] It is a 17α-alkylated AAS similar in structure to bolasterone (which is its 7α-isomer).

[1] Calusterone is on the World Anti-Doping Agency's list of prohibited substances,[3] and is therefore banned from use in most major sports.

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