The generic name of Yusui is Drospirenone Ethinyl Estradiol Tablets, which can cause the menstrual flow to become less heavy during the period of taking the medicine, but the menstrual flow can return to normal after stopping the medicine. Drospirenone ethinyl estradiol tablets contain both estrogen and progesterone, of which progesterone can make the endometrium undergo metaplasia, resulting in the endometrium showing a state of atrophy, making the endometrium thinner, and the thinning of the endometrium will cause a decrease in menstrual flow. In addition, it can inhibit follicular growth and prevent ovulation. Since the follicles cannot grow and develop normally, they cannot secrete estrogen, and a decrease in estrogen can also cause the endometrium to become thin and the amount of menstruation to become less. After taking the pill and finding that the menstrual flow becomes less, first of all, you should exclude pregnancy, although it is a good contraceptive effect, but it can not reach 100%. Without pregnancy, the low menstrual flow is only temporary, after stopping the drug, the endocrine secretion can return to normal, the endometrium will gradually thicken, so the amount of menstruation can be restored to the state before taking the drug. Drospirenone ethinyl estradiol tablets may cause serious adverse reactions such as cardiovascular events and stroke vascular events, liver disease, and some common adverse reactions including irregular uterine bleeding, nausea, breast tenderness, and headache. It is contraindicated in the presence of renal impairment, vascular disease, malignant tumors and other patients. Patients should always use the drug under the supervision of a doctor and seek medical attention for any adverse reactions.