The standard or classic regimen of mifepristone 600 mg followed 36 to 48 hours later by a prostaglandin analog, typically misoprostol 400 µg orally, is highly effective for abortion up to 49 days' gestation.r Mifepristone can be used at a dose of 200 mg, instead of 600 mg, with equal efficacy and lower cost. r When the misoprostol is used vaginally, the gestational age limit can be extended to 63 days and the medications can be administered as little as 6 to 8 hours apart or even simultaneously.r Buccal and sublingual misoprostol also are effective when used at 24-to 48-hour intervals after mifepristone. These alternative routes appear to have more side effects than vaginal administration.r Ultrasound examination 1 week after administering the medications is highly predictive of long-term success of the medical abortion procedure.r Methotrexate and misoprostol can be used as an alternative regimen in women up to 49 days' gestation. The methotrexate does not appear to have immediate effect in the abortion process; rather, by rendering the pregnancy nonviable, methotrexate may serve as a backup for women who do not abort shortly after misoprostol administration.r Misoprostol alone, in repeated doses, can be used for abortion where mifepristone is too expensive or unavailable. The recommended regimen for pregnancies up to 63 days' gestation is 800 µg administered vaginally every 3 to 24 hours for a maximum of three doses.