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目的：观察左炔诺孕酮和来非司酮用于紧急避孕的有效性、副反应及对月经的影响。方法：对214例要求72小时内紧急送孕的妇女以2：1随机分为二级。一组（LNG组）144例．口服左炔诺孕酮0．75mg．隔12小时再重复1次同样剂量；另一组（Mife组）70例．单次口服术非司酮25mg。结果：LNG组妊娠5例，失败率为3．47％，避孕有效率60．1％：Mife组妊娠1例，失败率1．42％．避孕有效率80．2％。二组服药后月经改变少．主诉有轻度恶心、头晕、乏力等到反应者LNG组占22.2％，Mife组24．3％。结论：左炔语孕酮或来非司酮都是有效的紧急避孕方法。
Objective: To observe the effectiveness of levonorgestrel and nifepristone in emergency contraception, side effects and their effects on menstruation. METHODS: A total of 214 women requiring urgent delivery within 72 hours were randomized to two levels at 2: 1. One group (LNG group) 144 cases. Levonorgestrel 0.75 mg orally. The same dose was repeated once every 12 hours; the other group (Mife group) 70 cases. A single oral administration of aspirin 25mg. Results: LNG group 5 cases of pregnancy, the failure rate was 3.47%, the contraceptive efficiency of 60.1%: Mife group of pregnancy in 1 case, the failure rate of 1.42%. Effective contraception 80.2%. Two groups after menstruation medication changes less. The chief complaint was mild nausea, dizziness, weakness until the responders LNG group accounted for 22.2%, Mife group 24.3%. CONCLUSIONS: Left prion progesterone or nifepristone are both effective emergency contraception methods.