mifepristone

American  

[mif-uh-pris-tohn] / ˌmɪf əˈprɪs toʊn /

noun

1. an antigestational drug, C 29 H 35 NO 2 , that prevents a fertilized egg from attaching to the uterine wall by blocking the action of progesterone.

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mifepristone British  

/ mɪˈfɛprɪˌstəʊn /

noun

1. an antiprogestogenic steroid, used in the medical termination of pregnancy. Formula: C 29 H 35 NO 2

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Etymology

Origin of mifepristone

1985–90; probably alteration of (a)mi(no)phe(nol) + pr(opyl) + est(radiol) + -one

Example Sentences

See Examples For:

mifepristone

But Joseph also ruled that the FDA deserved a chance to impose new limits on mifepristone before being ordered to do so by the court.

From Slate ● Sep. 16, 2026

However, when federal regulators previously reviewed environmental concerns related to mifepristone, they found no evidence warranting restrictions, according to Bernstein.

From Salon ● Jul. 6, 2026

Former FDA Commissioner Marty Makary, ousted last month, had promised lawmakers he would launch a mifepristone study but told others in the administration that he needed new data systems for the effort.

From The Wall Street Journal ● Jun. 5, 2026

Medication management, such as mifepristone plus misoprostol and a D&C are also used for terminating unwanted pregnancies.

From Salon ● May 26, 2026

Taking misoprostol alone has also become a standard treatment for unwanted pregnancies in countries where mifepristone is harder to come by.

From Slate ● May 18, 2026