If mifepristone is used to terminate an early pregnancy, it is often co-administered with misoprostol in order to achieve expulsion of the products of pregnancy from the uterine cavity. Mifepristone is mainly taken to kill the embryo, so as to achieve the purpose of termination of pregnancy, but after the death of the embryo needs to be expelled from the uterine cavity, it is necessary to take misoprostol. Misoprostol’s effect is mainly to promote the contraction of uterine smooth muscle, and at the same time can make the cervix soften, so that in the case of work will make the products of pregnancy from the uterine cavity. In this way, the purpose of termination of pregnancy is achieved, and clinically the drug should be given under the guidance of the doctor. In addition, between 5-7 weeks of pregnancy can be drug abortion, if more than 7 weeks can not be drug abortion, taking misoprostol must be given in the hospital for observation.