Mifepristone is absorbed into the gastrointestinal tract about 20 minutes after oral administration and will exert its effects, which may cause dizziness, nausea, vomiting or fatigue and weakness. Mifepristone can be used for oral emergency contraception within 72 hours after intercourse, and can also be used to terminate pregnancy. The main mechanism is that it will kill the embryo and stop its development to terminate pregnancy. If it is used to terminate a pregnancy, it is necessary to undergo appropriate tests before taking the drug, such as ultrasound to determine intrauterine pregnancy and the number of days of pregnancy, as well as routine blood tests, routine leucorrhea, clotting time, and electrocardiogram, and only if there are no problems can the drug be used for abortion.