The drug RU-486 is taken after sexual intercourse. It blocks implantation, and in this sense it prevents pregnancy:
like spermicidal foam
in a manner similar to tubal ligation
like the familiar birth control pill used for the last 30 years
by blocking progesterone receptors in the uterus, thus preventing progesterone from maintaining pregnancy
According to the NCERT text, progesterone is essential for maintaining the endometrium required for implantation and pregnancy . RU-486 (Mifepristone) functions as an antiprogestin; it blocks progesterone receptors, thereby making the uterus unsuitable for implantation and maintaining pregnancy. While the specific drug name is not in the standard NCERT text, the physiological principle of progesterone's role in implantation is covered.
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