1. Health
You can opt-out at any time. Please refer to our privacy policy for contact information.

RU486 – The Abortion Pill


Updated May 20, 2014

RU486 – The Abortion Pill


Photo Courtesy of Getty Images
Definition: RU486 (brand name Mifeprex) has been widely, effectively and safely used in France, Sweden and Great Britain for years, and RU486 is also FDA-approved to be used in the United States. The abortion pill (considered a medical abortion) must be provided by a healthcare professional.

RU486 contains the synthetic steroid mifepristone that interferes with the action of the body's progesterone (the hormone that builds up the uterine lining to prepare for pregnancy). A medical abortion typically consists of the use of two medications: RU486 (mifepristone), which causes a fertilized egg to not remain attached to the lining of the uterus, and misoprostol, which causes uterine contractions. The abortion pill is FDA-approved for women up to 7 weeks pregnant (5 weeks since conception) or up to 49 days after one's last menstrual period. RU486 helps to terminate a pregnancy (allowing a woman to completely pass the pregnancy) without surgery and is 92 to 98% effective when used in combination with misoprostol. When Mifepristone is used alone, it is only 64 to 85% effective. Although some healthcare providers will still use this method for women who are more than 7 weeks pregnant, use at this time is considered off-label (meaning, no longer FDA approved).


  • Effective

  • Less intrusive and painful to the body than surgical abortion


    • Some people are morally opposed to this method, because conception has occurred prior to use.

    • Mifepristone may not be an option for women with liver or kidney problems, anemia, diabetes, Rh-negative blood or those who are very overweight.

    • This method requires several visits to the doctor and may not work if combined with other drugs, such as ibuprofen.
    Side Effects:
    • Minor cramping
    • Possible nausea
    • Vomiting and diarrhea
    • Bleeding can last 8 to 10 days

  • Also Known As: Mifeprex, The Abortion Pill, Medical Abortion, Mifepristone, Early Abortion, Non-surgical Abortion
    Alternate Spellings: RU 486, RU-486
    RU486 can be used to medically terminate a pregnancy that is under 7 weeks.


    Spitz, I.M., Bardin, C.W., Benton, L. & Robbins, A. (1998). Early pregnancy termination with mifepristone and misoprostol in the United States. New England Journal of Medicine, 338(18):1241-47. Accessed through private subscription 5/12/08.

    ©2014 About.com. All rights reserved.

    We comply with the HONcode standard
    for trustworthy health
    information: verify here.