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Intramuscular (15S)-15-Methyl Prostaglandin F₂ for Midtrimester and Missed Abortions

From the Department of Obstetrics and Gynecology. University of Hawaii School of Medicine, Honolulu, Hawaii.

The efficacy of intramuscular 15-me-PGF₂ as an abortifacient was evaluated in 40 women between 14 and 20 weeks of gestation and 6 patients with missed abortions. Pregnancy was successfully terminated in all the cases. The injection-abortion interval was significantly lower in 20 patients (Group II) who had intracervical laminaria insertion prior to treatment with 15-me-PGF₂ than in 10 women (Group I) without laminaria insertion (t = 7.2; P < .001). Abortion was also accomplished in 10 women with ruptured membranes and 6 patients with missed abortions. Gastrointestinal side effects were minimal and acceptable when premedication with antiemetics and an antidiarrheal was used. This study demonstrates the availability of the intramuscular route—a simple, safe, and reliable means of terminating pregnancy, especially during the early midtrimester period.