Comparison of 400 mcg buccal and 400 mcg sublingual misoprostol after mifepristone medical abortion through 63 days' LMP: a randomized controlled trial

Contraception. 2010 Dec;82(6):513-9. doi: 10.1016/j.contraception.2010.05.013. Epub 2010 Jun 25.


Background: Buccal misoprostol 800 mcg and sublingual misoprostol 400 mcg demonstrate high efficacy and few adverse effects when used with 200 mg mifepristone for medical abortion through 63 days since the last menstrual period (LMP). Little is known about a 400-mcg buccal dose. This study compares two in-the-mouth routes of misoprostol using the same dose.

Study design: Eligible and consenting women (n=550) were randomized to 400 mcg of misoprostol buccally or sublingually 24 h after ingestion of 200 mg of mifepristone. Abortion status was assessed 2 weeks later.

Results: Complete abortion occurred in 97.1% of the buccal group and 97.4% of the sublingual group (p=.97, RR: 1.00, 95% CI=0.97-1.03). Adverse effects were similar in both groups. Over 90% of women in both arms expressed high satisfaction with the method.

Conclusions: Both 400 mcg buccal misoprostol and 400 mcg sublingual misoprostol after mifepristone appear to be good options for medical abortion through 63 days' LMP.

Publication types

  • Randomized Controlled Trial

MeSH terms

  • Abortifacient Agents / administration & dosage*
  • Abortifacient Agents / adverse effects
  • Abortion, Induced*
  • Administration, Buccal
  • Administration, Sublingual
  • Adolescent
  • Adult
  • Female
  • Humans
  • Menstrual Cycle / drug effects
  • Mifepristone / administration & dosage*
  • Mifepristone / adverse effects
  • Misoprostol / administration & dosage*
  • Misoprostol / adverse effects
  • Patient Satisfaction
  • Treatment Outcome


  • Abortifacient Agents
  • Misoprostol
  • Mifepristone