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A synthetic steroid, C29H35NO2, that blocks the action of progesterone and is used in combination with misoprostol to induce abortion in early pregnancy. Also called RU 486.

[(a)mi(no) + alteration of phe(nyl) + pr(opyl) + alteration of est(radiol) + -one.]


(Pharmacology) an antiprogestogenic steroid, used in the medical termination of pregnancy. Formula: C29H35NO2
[C20: from aminophenol + propyne + oestradiol + -one]


(ˌmɪf əˈprɪs toʊn)
an antigestational drug that prevents a fertilized egg from attaching to the uterine wall by blocking the action of progesterone.
[1985–90; probably alter. of (a)mi(no)phe(nol) + pr(opyl) + est(radiol) + -one]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.mifepristone - an abortion-inducing drug (trade name RU_486) developed in Francemifepristone - an abortion-inducing drug (trade name RU_486) developed in France; when taken during the first five weeks of pregnancy it blocks the action of progesterone so that the uterus sloughs off the embryo
aborticide, abortifacient, abortion-inducing drug - a drug (or other chemical agent) that causes abortion


n mifepristona
References in periodicals archive ?
The Contraception study also reveals how the abortion establishment not only defends but promotes the online sales of these drugs, and how this fits in with their long-term plans for expanding the use of the abortion pill in the United States.
Increasingly, women are choosing to terminate unwanted pregnancies using the abortion pill, a combination of the drugs misoprostol and mifepristone.
Many of them still buy the abortion pill and bring it home by breaking the law.
Fiona Bloomer from Ulster University pointed to the new mention of the abortion pill in the guidelines.
The Irish Family Planning Association said it knew "many women and girls seek the abortion pill online" as an alternative to travelling to another country to access termination services.
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Despite this criticism, at the end of last year Planned Parenthood released a "study" that argues that the abortion pill is "safe.
The media are recognising that the abortion pill is having a significant impact on the delivery of abortion in the United States.
Family Planning Association (FPA) president Christiana Kouta said the FPA was not in favour of the abortion pill as it had serious side effects and risked being incomplete.
And Jane Henney, who ran the agency when the abortion pill RU-486 pill was approved, is among those reportedly being considered for FDA chief under President-elect Barack Obama.
A CHEMICAL used in the abortion pill could provide a new weapon against breast and ovarian cancers, say researchers.
Since 2000, misoprostol has been used with little fanfare in conjunction with the abortion pill mifepristone, commonly referred to as RU-486.