Reuters
In a study involving about 2000 women, Dr. Haitham Hamoda of the University of Aberdeen and colleagues compared the efficacy, adverse effects, and acceptability of a single 10-milligram dose of mifepristone with two 750-microgram doses of levonorgestrel 12 hours apart. The agents were taken within 120 hours of unprotected sexual intercourse
The failure rates were 1.5 percent with mifepristone and 2.3 percent with levonorgestrel -- not a statistical difference -- the investigators report in the medical journal Obstetrics and Gynecology. However, also statistically, they could not rule out the possibility that levonorgestrel might be less effective than mifepristone.
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