Gestrinone

Gestrinone is a synthetic steroid with mixed progestogen and antiprogestogen (i.e., partial agonist) effects, and also has some mild androgenic activity. It is marketed under the names Dimetriose, Dimetrose, and Nemestran, as a treatment for endometriosis. Gestrinone is available in many countries, but not in the USA. As it has anabolic effects, its use in competition has been banned by the International Olympic Committee.