Mifepristone, also known as the "abortion pill", is a medication used in medication abortion. It is part of a two-step process to terminate a pregnancy. It works by blocking the hormone progesterone, which is necessary to sustain a pregnancy. Mifepristone is a safe and effective method of abortion for many patients and is increasingly being used as an alternative to surgical abortion. The history of mifepristone can be traced back to the 1980s, when French researchers developed the drug as a possible treatment for high blood pressure and other conditions. Although these trials were not successful, the research did show that the drug had an antiprogestin effect.
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