Use Table 47.2 to compare and contrast the mechanisms of action of emergency contraception and m

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Use Table 47.2 to compare and contrast the mechanisms of...

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Key Concepts

Emergency Contraception

This method is used shortly after unprotected intercourse to prevent pregnancy. It operates primarily by disrupting the natural sequence leading to fertilization and implantation—often by delaying or inhibiting ovulation and, in some formulations at high doses, altering the endometrial lining. Its role is purely contraceptive, as it does not terminate a pregnancy that is already established.

Oral Contraceptive Pill

The pill is a prophylactic method of contraception that is taken regularly to prevent pregnancy. It works primarily by using synthetic hormones to suppress ovulation, thicken cervical mucus to block sperm entry, and alter the uterine lining to reduce the likelihood of successful implantation. Its continuous use maintains a hormonal environment that prevents fertilization, making it a reliable contraceptive measure.

Mifepristone

Mifepristone is a medication that functions as an antiprogestin by blocking the action of progesterone, a hormone essential for maintaining early pregnancy. By interfering with progesterone signaling, it leads to the breakdown of the uterine lining and the termination of an established pregnancy. Unlike contraceptive methods that prevent conception, mifepristone is used to end an already established pregnancy.

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