Unwanted pregnancy wants to take medication to abort the pregnancy, at present, the commonly used clinical drugs are mifepristone and misoprostol tablets pairing. Mifepristone is an anti-progestin, and the endometrial progesterone receptor binding capacity is five times higher than that of progesterone, through competitive binding of progesterone receptors, blocking progesterone activity, while it can increase the sensitivity of the uterus to prostaglandins, promote contractions and soften the cervix. Misoprostol tablets are analogues of prostaglandins and have the pharmacological activity of prostaglandins, which can soften the cervix, enhance uterine tone and pressure in the uterine cavity, and are used in conjunction with mifepristone to enhance the frequency and amplitude of spontaneous uterine contractions in early pregnancy. Medical abortion must be carried out only after a thorough examination in the hospital and only if there are indications for medical abortion. Medical abortion is limited to early intrauterine pregnancy within 49 days of pregnancy, the diameter of the gestational sac is less than 2.5cm, and healthy women between the ages of 18-40 years old can carry out medical abortion. You can’t blindly take the drug yourself, you must go to a regular medical institution and take the drug under the guidance of a doctor, otherwise it will easily lead to hemorrhage and other serious consequences.