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- W72483322 endingPage "163" @default.
- W72483322 startingPage "136" @default.
- W72483322 abstract "Literature on the mechanism of action of contraceptive steroids is reviewed. Because the physiologic mechanisms regulating human reproductive processes are incompletely understood it is difficult to evaluate some of the pharmacologic effects of contraceptive steroids. Further various formulations or different doses of the same preparation may exert different modes of action. Generally most contraceptive steroid formulations inhibit ovulation by acting at the hypothalamopituitary level. Apparently the estrogen component of oral contraceptives (OCs) acts by interfering with the production of follicle stimulating hormone (FSH) while the progestogens suppress the midcycle peak of luteinizing hormone (LH) without affecting basal LH levels. Long-term use of combined OCs markedly diminishes the secretion of both FSH and LH and depresses ovarian activity. In contrast continuous administration of low-doses of progestogens do not consistently prevent ovulation yet provide good contraceptive efficacy though their mechanism of action is not known. Animal experiemnts have shown that contraceptive steroids can inhibit sperm capacitation in the female genital tract interfere with fertilization and tubal transport of ovum prevent implantation and cause physiochemical changes in cervical mucus. Whether these effects are involved in the mechanism(s) of action of contraceptive steroids in humans remains to be determined." @default.
- W72483322 created "2016-06-24" @default.
- W72483322 creator A5007846525 @default.
- W72483322 date "1968-01-01" @default.
- W72483322 modified "2023-10-16" @default.
- W72483322 title "Mode of action of contraceptive drugs*" @default.
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