18,19-Dinorpregna-4,9,11-trien-20-yn-3-one, 13-ethyl-17-hydroxy-, (17alpha)-
Aventis Brand of Gestrinone
Florizel Brand of Gestrinone
Hoechst Brand of Gestrinone
A non-estrogenic contraceptive which is a weak progestin with strong anti-progesterone properties. It is effective if used once a week orally or can also be used in intravaginal devices.