Updated November 2016

INTRODUCTION

Millions of women worldwide have safely terminated their pregnancies with medication since mifepristone—or RU 486—was first introduced in the late 1980s. Research in the past two decades has identified several highly effective regimens for early medical abortion.1 Whether taken in a health center or at home by women themselves, regimens using pills offer an option that many women prefer to surgical abortion procedures such as manual vacuum aspiration or dilation and curettage (D&C).

Because mifepristone is a registered abortion drug, its sale and use are not permitted in most countries with restrictive abortion laws. In contrast, misoprostol is an anti-ulcer medication, and is registered under various trade names worldwide.2,3 Research has found that misoprostol alone is about 75-85 percent successful in inducing abortion in the first trimester when used as recommended. Although less effective alone than when combined with mifepristone, misoprostol offers a safe and accessible alternative for women.

GUIDELINES FOR USING MISOPROSTOL TO INDUCE ABORTION

Misoprostol is typically sold in pharmacies in tablets of 200 mcg. Four tablets are recommended to initiate an early abortion, and four (or, rarely, eight) more may be required for its completion. It is best to use misoprostol within nine weeks since the last menstruation; that is, fewer than 63 days counting from the first day of the last regular period. The earlier in pregnancy misoprostol is administered the better, because it is safer, more effective, and less painful. Misoprostol can be used later in pregnancy but the risks of complications are higher (see below). Women with an intrauterine contraceptive device (IUD) in place should have it removed before using misoprostol.

GUIDELINES FOR PREGNANCIES UP TO 12 WEEKS: 4

Step 1:  Place four 200-mcg tablets (or their equivalent) in the mouth under the tongue or in the cheek pouch. Hold tablets in the mouth for 20-30 minutes to allow them to dissolve, and then swallow the remaining fragments.

During this process, you may experience bleeding that is somewhat heavier than for a period. That is normal. You should have a supply of thick sanitary napkins on hand.

Bleeding and uterine contractions (cramping) may begin as quickly as 30 minutes following this first step. If bleeding and contractions do not start within 3 hours, see Step 2 (below).

Bleeding itself does not mean that an abortion has occurred. Close inspection of the sanitary pad or other receptacle can reveal whether the pregnancy has been terminated. This will be difficult to detect in the very early stages of pregnancy, however, because the embryonic tissue is indistinguishable from the normal clotting of menstrual blood. For example, six weeks into pregnancy (that is, six weeks from the first day of the last menstrual period), the embryonic sac is only about the size of a short grain of rice. By the eighth week it is more visible, about the size of a kidney bean. For terminations from 10-12 weeks, the fetus is 30 mm to 8 cm in length (1+ to 3+ inches) and it will be very clear when it has passed.

If it is not clear that the pregnancy has been terminated within three hours of taking the first dose—for example, if the embryonic sac is not visible on the sanitary pad, or if cramping continues without diminishing—go to Step 2.

Step 2:  Place four more 200-mcg tablets under the tongue or in the cheek pouch and hold them there for 20-30 minutes until they dissolve.

Step 3:  If the pregnancy has not been terminated three hours after using the second set of pills and bleeding, take four more 200 mcg tablets of misoprostol.

The majority of pregnancies up to 12 weeks duration are terminated within hours of the first administration of misoprostol. Generally, more than three-quarters of women experience an abortion within the first 24 hours, although it sometimes takes longer.4 If unsuccessful, the entire process may be repeated.

GUIDELINES FOR PREGNANCIES OF 13-20 WEEKS: 5

Although misoprostol alone can also be used for second-trimester abortions, the chances of serious complications such as uterine rupture or hemorrhage rise as pregnancy advances. Ready access to emergency care in a medical facility is essential, and women should not attempt an abortion alone.  They must also be prepared for the passing of the fetus and placenta at this stage.

Step 1:  Insert only two (not four) 200-mcg tablets under the tongue or in the cheek pouch. The termination of second-trimester pregnancies requires lower doses of misoprostol because the uterus is, at this point of pregnancy, more sensitive to the drug. Overdoses at this stage of pregnancy are dangerous. Wait three hours before taking another dose.

Repeat Doses:  Insert two more 200-mcg tablets under the tongue or in the cheek pouch every 3 hours.

When bleeding and contractions begin, it is advisable to go to a hospital and report a miscarriage. The hospital may perform a surgical procedure—manual vacuum aspiration or D&C—to complete the process if it does not occur naturally. In countries where abortion is highly restricted by law, be aware that hospital personnel may be required to report all suspected induced abortion attempts to legal authorities, and may report miscarriages as such.

For women who choose to continue at home, repeat doses until the termination is complete. About half of women complete the process within 24 hours, and most women complete the process within 48 hours.6

INTENDED EFFECTS AND SIDE EFFECTS OF MISOPROSTOL

Bleeding and uterine contractions (cramping) are the intended effects of using misoprostol for inducing an abortion.1,4,5 Cramping will be stronger than for an ordinary menstrual period and may be painful. Nonsteroid anti-inflammatory pain medication such as ibuprofen may be taken without interfering with the misoprostol. Bleeding will be heavier and more prolonged than for a normal period: up to a week, in most cases, often with continued spotting until menstruation resumes in four to six weeks. These effects will be more pronounced in pregnancies of longer duration.

Chills and fever are common side effects but are transient. High fever is less common, but can occur and usually disappears within a few hours, as do nausea, vomiting, and diarrhea.

Women should seek medical attention if they experience any of the following side effects after taking misoprostol:

  • very heavy bleeding (soaking more than two large-sized thick sanitary pads each hour for more than two consecutive hours);
  • continuous bleeding for several days resulting in dizziness or light-headedness;
  • bleeding that stops but is followed two weeks or later by a sudden onset of extremely heavy bleeding, which may require manual vacuum aspiration or D&C;
  • scant bleeding or no bleeding at all in the first seven days after using misoprostol, which may suggest that no abortion has occurred and require a repeat round of misoprostol or surgical termination;
  • chills and fever lasting more than 24 hours after the last dose of misoprostol, which suggest that an infection may be present requiring treatment with antibiotics; or
  • severe abdominal pain that lasts more than 24 hours after the last dose of misoprostol.

Women should not take misoprostol if they have a known allergy to misoprostol.

WHERE TO BUY MISOPROSTOL

In most countries, misoprostol can be purchased in pharmacies as Cytotec or under some other trade name as an anti-ulcer medication. Some pharmacies may ask for a medical prescription for this purpose. Buying so-called “abortion drugs” on the black market or from unknown Internet sources is not recommended. Women can also purchase the combined mifepristone-misoprostol regimen online from Women on Web in the Netherlands (http://www.womenonweb.org) with a donation of 70-90 Euros (exceptions are made in difficult cases). This price may be higher than misoprostol tablets purchased locally, but the drugs are of known quality, and the combined regimen is significantly more effective than misoprostol used alone. Women Help Women (https://womenhelp.org) and Safe2Choose (https://safe2choose.org) also provide safe access to abortion medication.

For more information on medical abortion, consult these web sites:

REFERENCES

  1. Gynuity Health Projects. 2009. “Providing Medical Abortion in Low-Resource Settings: An Introductory Guidebook.” Second Edition. New York: Gynuity. http://gynuity.org/resources/info/medical-abortion-guidebook/
  2. A. Faúndes et al. 2007. “Misoprostol for the termination of pregnancy up to 12 completed weeks of pregnancy.” International Journal of Gynecology & Obstetrics 99 (Supplement 2): S172-S177. http://www.misoprostol.org/downloads/misoprostol-journals/IJGO_1triabn_Faundes.pdf
  3. Maria M. Fernandez et al. 2009. “Assessing the global availability of misoprostol.” International Journal of Gynecology and Obstetrics 105:180-186. https://www.researchgate.net/publication/24200771_Assessing_the_global_availability_of_misoprostol
  4. World Health Organization. 2012. “Safe Abortion: Technical and Policy Guidance for Health Systems.” Second Edition. Geneva: WHO. http://apps.who.int/iris/bitstream/10665/70914/1/9789241548434_eng.pdf?ua=1
  5. P. C. Ho et al. 2007. “Misoprostol for the termination of pregnancy with a live fetus at 13 to 26 weeks.” International Journal of Gynecology & Obstetrics 99 (Supplement 2):S178-S181.
  6. R. Dabash et al. 2015. “A double-blind randomized controlled trial of mifepristone or placebo before buccal misoprostol for abortion at 14–21 weeks of pregnancy” International Journal of Gynecology & Obstetrics 130: 40-44.