| levonorgestrel | <chemical> A progestational hormone with actions similar to those of progesterone and about twice as potent as its racaemic or (+-)-isomer (norgestrel). It is used for contraception, control of menstrual disorders, and treatment of endometriosis. Pharmacological action: contraceptive agents, female, contraceptives, oral, synthetic, progestational hormones, synthetic. Chemical name: 18,19-Dinorpregn-4-en-20-yn-3-one, 13-ethyl-17-hydroxy-, (17alpha)-(-)- (12 Dec 1998) |
|---|