What is the mechanism of action of contraceptive pills?

Answers (2)

14 Feb 2011

Combined oral contraceptive pills were developed to prevent ovulation by suppressing the release of gonadotropins. Combined hormonal contraceptives, including COCPs, inhibit follicular development and prevent ovulation as their primary mechanism of action.

Progestagen negative feedback decreases the pulse frequency of gonadotropin-releasing hormone (GnRH) release by the hypothalamus, which decreases the release of follicle-stimulating hormone (FSH) and greatly decreases the release of luteinizing hormone (LH) by the anterior pituitary. Decreased levels of FSH inhibit follicular development, preventing an increase in estradiol levels. Progestagen negative feedback and the lack of estrogen positive feedback on LH release prevent a mid-cycle LH surge. Inhibition of follicular development and the absence of a LH surge prevent ovulation.

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Votes: +0

15 Feb 2011

There are two different kinds of birth control pills — combination birth control pills, which contain estrogen and progestin, and minipills, which contain only progestin.

Combination birth control pills suppress ovulation — keeping your ovaries from releasing an egg. Combination birth control pills also thicken cervical mucus and thin the lining of the uterus (endometrium) to keep sperm from reaching the egg.

The minipill thickens cervical mucus and thins the endometrium — preventing sperm from reaching the egg. The minipill also sometimes suppresses ovulation. Unlike combination birth control pills, the minipill doesn't contain estrogen. The progestin dose in a minipill is also lower than the progestin dose in any combination oral contraceptive pill.

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