After taking mifepristone, nausea, vomiting, irregular vaginal bleeding and menstrual disorders may occur, and the symptoms are usually few and mild. Mifepristone is currently a commonly used emergency contraceptive in China, and is an anti-progestin preparation. Mifepristone 10mg can be taken within 120 hours of unprotected sexual intercourse, with an effective rate of more than 85%. Mifepristone side effects are few and mild, nausea, vomiting, irregular vaginal bleeding, menstrual disorders and other symptoms may occur after taking the drug, generally do not need special treatment. Due to individual differences, different individuals may experience different symptoms. Emergency contraception is only applicable to unprotected sex emergency contraception, contraceptive efficiency is significantly lower than the conventional contraceptive methods, and the hormone demand is large, can not replace the conventional means of contraception for long-term use. For specific use of the drug, consult a medical professional.