Hum. Reprod. Advance Access originally published online on July 21, 2005
Human Reproduction 2005 20(11):3062-3066; doi:10.1093/humrep/dei196
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A prospective randomized comparison of sublingual and oral misoprostol when combined with mifepristone for medical abortion at 1220 weeks gestation
1 Department of Obstetrics and Gynaecology, The University of Hong Kong, Queen Mary Hospital, Hong Kong SAR, China
1 To whom correspondence should be addressed: 6/F, Professorial Block, Department of Obstetrics and Gynaecology, The University of Hong Kong, Queen Mary Hospital, 102, Pokfulam Road, Hong Kong SAR, China. E-mail: ostang{at}graduate.hku.hk
BACKGROUND: Sublingual misoprostol has been shown to be effective in medical abortion. A prospective double-blinded placebo-controlled trial was done to compare the efficacy and side-effects of sublingual to oral misoprostol when used with mifepristone for medical abortion from 12 to 20 weeks gestation. METHODS: A total of 120 women at 1220 weeks of gestation were randomized to receive 200 mg oral mifepristone followed by either sublingual or oral misoprostol 400 mg every 3 h for a maximum of five doses 3648 h later. The course of misoprostol was repeated if the woman did not abort within 24 h. RESULTS: There was no significant difference (P = 0.43) in the success rate at 24 h [relative risk = 1.075; 95% confidence interval (CI): 0.941.19]. Abortion occurred in 91.4% in the sublingual group (95% CI: 81.096.7%) as compared to 85.0% (95% CI: 73.792.1%) in the oral group. The median induction-to-abortion interval was significantly shorter (P = 0.009) in the sublingual group (5.5 h) as compared to the oral group (7.5 h). The incidence of fever was higher in the sublingual group (P < 0.0001). The incidences of other side-effects were similar. CONCLUSION: Sublingual misoprostol, when combined with mifepristone, is effective for medical abortion in the second trimester. The induction-to-abortion interval is shorter when sublingual misoprostol is used when compared to oral misoprostol.
Key words: abortion/misoprostol/oral/second trimester/sublingual
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