A comparison of two dosing regimens of intravaginal misoprostol for second-trimester pregnancy termination

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Abstract
Objective: To compare the effectiveness of misoprostol administered intravaginally every 6 versus every 12 hours for termination of second-trimester pregnancies. Methods: One hundred pregnant women at 12–22 weeks’ gestation were randomized to receive 200 μg of misoprostol intravaginally either every 6 or every 12 hours for up to 48 hours. Results: The incidences of abortion within 48 hours after initial drug administration were 87.2 and 89.2%, the complete abortion rates 43.9 and 33.3%, and the mean abortion intervals 13.8 and 14.0 hours in the 6- and 12-hour groups, respectively. Side effects were similar between groups. Conclusion: Misoprostol administered vaginally is effective for terminating second-trimester pregnancies. Shortening the dosing interval from 12 to 6 hours produced no significant benefit.

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