There are two types of medication for abortion, mifepristone to kill the embryo and misoprostol to inhibit uterine contractions and promote the discharge of the fetal sac, both of which need to be combined to be effective. The two drugs need to be combined to be effective. A medical abortion needs to be determined within 49 days of intrauterine pregnancy, when the fetal sac is small, the fetal membrane is small, the residual tissue is small, and the chances of a complete abortion are very high.