![](https://webarchive.library.unt.edu/eot2008/20090514043231im_/http://www.cancer.gov/images/spacer.gif) |
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(MIH-feh-PREX)
![](https://webarchive.library.unt.edu/eot2008/20090514043231im_/http://www.cancer.gov/images/spacer.gif)
| A drug used to end early pregnancies. It is also being studied in the treatment of some types of cancer and other conditions. Mifeprex blocks the action of progesterone, a hormone that helps some cancers grow. It is a type of antiprogesterone. Also called mifepristone and RU 486. |
Previous Definitions: | microwave therapy, microwave thermotherapy, midazolam, midazolam hydrochloride, midostaurin | Next Definitions: | mifepristone, milk duct, milk thistle, milligram, milliliter |
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![](https://webarchive.library.unt.edu/eot2008/20090514043231im_/http://www.cancer.gov/images/spacer.gif) |