Medical abortion, or drug abortion, is commonly used for intrauterine pregnancies <49 days. If the medication is used correctly and there are no other unforeseen circumstances, the success rate of medication abortion on 42 days of pregnancy is relatively high. Before medical abortion, first check whether the pregnant woman has contraindications to drugs, whether the pregnancy has been 40-49 days, if not more than 40 days, check the gestational sac can not be identified, it is impossible to determine the intrauterine pregnancy, if more than 49 days, the gestational sac is too large, it is likely to lead to incomplete abortion. In addition, other tests should be done to exclude vaginitis, pelvic inflammatory disease and other diseases, and other tests, such as electrocardiogram, blood routine, etc., to ensure that the relevant indicators are within the normal range. After determining that you can have a medical abortion, use mifepristone and misoprostol orally under the guidance of a professional physician. The first use of mifepristone interferes with the implantation, playing a role in killing the embryo, and at the same time make the embryonic tissue necrosis. Misoprostol is then added to induce uterine contractions, causing the embryonic tissue to flow out of the uterine cavity. Usually the embryo will flow out shortly after taking misoprostol. If nothing else happens in the middle of the medical abortion, the success rate of medical abortion is high. If there are individual circumstances, such as a relatively large gestational sac, or if the pregnant woman is resistant to the medication, the chances of an incomplete abortion are relatively higher. If there are uncomfortable symptoms such as lower abdominal pain and vaginal bleeding after the abortion, you should go to the hospital in time for medical consultation. There may be residues in the uterine cavity, which need to be cleansed in order to avoid hemorrhage, infection and other health effects.