Hormonal Contraception
Hormonal contraception refers to birth control methods that act on the hormonal system. Currently, all hormonal contraceptives are designed for use by women rather than men, though research on a male hormonal contraceptive (“the male Pill”) has been underway for some time.
Hormonal contraceptives may be introduced into the woman’s body in many different ways, among them orally, vaginally, transdermally, or through injections or implants. The oral method was the first and most famous of these; within a few years of its introduction in 1960, "the Pill" became one of the most popular contraceptives in the United States and elsewhere, and it remains so today.
Hormonal contraception may act in one or more ways to prevent pregnancy. It may cause ovulation to cease, preventing the possibility of fertilization; it may thicken the woman’s cervical mucus, making penetration of the uterus by sperm more difficult; or it may alter and thin the endometrium so that a fertilized egg has difficulty implanting. (Technically, if the drug works in this third fashion, it acts as a contragestive rather than a contraceptive, since it has not prevented conception, acting instead to prevent gestation
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