Mifepristone acts by antagonizing progesterone activity and is commonly used to combat early pregnancy. Its harm is mainly can produce severe bleeding and other adverse reactions. 1. Role: Mifepristone can antagonize the activity of progesterone, and its use in early pregnancy has the effect of destroying the uterine membrane, enhancing the contraction of uterine smooth muscle, softening and dilating the cervix, thus inducing abortion. It is commonly used in anti-early pregnancy, emergency contraception and induction of labor. 2. Harm: Because Mifepristone is generally used orally, it can cause nausea, vomiting, abdominal pain, diarrhea side effects. Severe bleeding can also occur in a small number of users. Mifepristone should be used under the supervision of a doctor. If used for medicated abortion, it must be performed in a regular resuscitation facility and under the close supervision of medical personnel.