Misoprostol is a commonly used abortion drug, if the embryonic tissue is not discharged even after 4 days of taking it, it means that there is residue in the uterine cavity and the abortion has failed, which may be related to the improper use of the drug or the long pregnancy cycle and other factors. Women can take Misoprostol and other drugs for medication abortion after an unwanted pregnancy, if the dose of the drug is not enough or the interval between drugs is not right, it may affect the effect of the drug, resulting in the gestational sac can not be normally discharged from the body, if the pregnancy cycle is longer, such as more than three months, the embryo is well developed, the effect of medication abortion will not be particularly obvious. Therefore, if the embryo is still not discharged after 4 days of medication abortion, it is necessary to go to the hospital for ultrasound examination to clarify whether there is any residual embryo in the uterus, and it is necessary to do the purging surgery to avoid the after-effects.