norethisterone -->
medical dictionary


(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)