It is necessary for women to take this medicine to play the role of pharmacological scraping when the following conditions occur: 1) residues are found in the uterine cavity after abortion surgery; 2) a small amount of fetal membrane remains in the uterine cavity after normal delivery; 3) the endometrium of menopausal women is thickened and they have not had menstruation for a long time. In all these cases, you can take Didrogestrel and then suddenly stop taking it, when the endometrium will lose the protection of hormones and a lot of bleeding will occur, and the bleeding can flow out the residual tissues. However, this method is not suitable if the patient is already bleeding heavily and has anemia before taking the medication.