The French abortion pill, also known as RU-486. RU-486 has been used in combination with another drug called misoprostol, terminate pregnancy at an early stage. It is used with women who are no more than 7 weeks pregnant. The drug has 95% effectiveness. About 5% of women using RU-486 in early pregnancies need additional medical intervention because of incomplete abortions. (doctors often intervene at higher rates in cases of natural miscarriages). The side effects with RU-486 are similar to those of a natural miscarriage.
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Synthetic chemical compound with antiprogesterone properties used for early pregnancy termination; the substance binds with glucocorticoid receptors resulting in increased adrenal gland secretion. SYN: RU-486.

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mi·fep·ris·tone .mi-fə-'pris-.tōn, mi-'fep-ri-.stōn n RU-486

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a drug used to produce an abortion within the first 20 weeks of pregnancy: it acts by blocking the action of progesterone, which is essential for maintaining pregnancy. It is taken by mouth, followed after 36 hours by gemeprost intravaginally. Side-effects include faintness, headache, and vaginal bleeding. Trade name: Mifegyne.

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mif·e·pris·tone (mif″ə-prisґtōn) an antiprogestin used in combination with misoprostol or other prostaglandin as a postcoital contraceptive, terminating pregnancy in the first trimester; administered orally. Called also RU-486.

Medical dictionary. 2011.

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  • mifepristone — noun Etymology: perhaps from International Scientific Vocabulary amino + fe (alteration of phen ) + pri (alteration of prop ) + estradiol + one Date: 1985 RU 486 …   New Collegiate Dictionary

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  • mifepristone — [ˌmɪfɛ prɪstəʊn] noun Medicine a synthetic steroid that inhibits the action of progesterone, given orally in early pregnancy to induce abortion. Origin 1980s: prob. from Du. mifepriston, from mife (representing aminophenol) + pr (representing… …   English new terms dictionary

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