Morning After Pill
The “morning after pill” is marketed as an emergency contraception method. The most commonly used preparation contains a high level of a progestin and can be taken up to 72 hours after sexual intercourse. New insight into how it works make it clear that it can prevent implantation of the young human embryo into the lining of the uterus. This is a contragestational or abortifacient effect, not a contraceptive effect. The abortion pill, mifepristone, is taken up to seven to nine weeks into a pregnancy with the intention of causing an abortion. It works by blocking progesterone receptors. Progesterone is the necessary hormone that nurtures and supports a pregnancy.