Gestrinone

**Definition:** 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.

**Tree numbers:** - D04.210.500.668.651.568.620.400

**Synonyms:** - 18,19-Dinorpregna-4,9,11-trien-20-yn-3-one, 13-ethyl-17-hydroxy-, (17alpha)-