| mestranol | <chemical> (17 alpha)-3-methoxy-19-norpregna-1,3,5(10)-trien-20-yn-17-ol. The 3-methyl ether of ethinyl estradiol. It must be demethylated before it becomes biologically active. It is used as the oestrogen component of many combination oral contraceptives. Pharmacological action: oestrogens, synthetic. Chemical name: 19-Norpregna-1,3,5(10)-trien-20-yn-17-ol, 3-methoxy-, (17alpha)- (12 Dec 1998) |
|---|---|
| norethindrone | <chemical> (l7 alpha)-17 hydroxy-19-norpregn-4-en-20-yn-3-one. A synthetic progestational hormone with actions similar to those of progesterone but functioning as a more potent inhibitor of ovulation. It has weak oestrogenic and androgenic properties. The hormone has been used in treating amenorrhoea, functional uterine bleeding, endometriosis, and for contraception. Pharmacological action: contraceptives, oral, synthetic, progestational hormones, synthetic. Chemical name: 19-Norpregn-4-en-20-yn-3-one, 17-hydroxy-, (17alpha)- (12 Dec 1998) |