As an over-the-counter preparation, the contraceptive pill is more and more widely used in contemporary society, and many female patients do not have an accurate understanding of the contraceptive pill, now some of the knowledge related to it is popularized as follows, hoping to enhance the majority of female patients on the contraceptive pill some understanding. Contraceptive pill, also known as steroidal hormonal contraceptives, its main components are estrogen and progesterone, is a highly effective contraceptive method. The main mechanisms of its action are: 1, inhibit ovulation; 2, change the shape of the cervical mucus, so that its viscosity increases, is not conducive to sperm penetration; 3, change the morphology and function of the endometrium, so that the endometrial growth is not synchronized with the development of the embryo, which is not conducive to the implantation of fertilized eggs; 4, change the function of the fallopian tubes, change the normal movement of fertilized eggs in the fallopian tubes, interfering with fertilized egg implantation. At present, the contraceptives we commonly use are mainly the second-generation compound oral contraceptive pill and the third-generation compound oral contraceptive pill. The second generation of oral contraceptives is mainly composed of levodroproprogestrel, Yutting belongs to this category; the third generation of oral contraceptives are compound deoxyprogesterone tablets, compound progesterone tablets and so on, that is, Momoflurane, Mintin even and so on. The second generation of Yutin, for example, is used for unprotected intercourse or contraceptive method failure (condom slippage or rupture, loss of control of extracorporeal spermatozoa, failure to calculate the safe period, etc.) of the contraceptive aftermath. It is taken by taking one tablet (0.75mg) of Yutin within 72 hours (3 days) of unprotected intercourse or contraceptive failure, followed by another tablet (totaling 1.5mg) 12 hours later. The third generation is a combination of estrogen and progesterone consisting of 21 tablets. Start taking the first tablet on the 5th day of menstruation for 22 days and stop taking the second cycle after 7 days. If there is a missed dose, make up the dose as soon as possible and be alert to the possibility of pregnancy. If 2 tablets are missed, other contraceptive measures should be added after making up the dose, and 3 tablets should be stopped and the next cycle of the drug should be started after bleeding. Contraindications to oral contraceptives are: 1, severe cardiovascular disease, thrombophilia (such as hypertension, coronary heart disease, venous embolism, etc.) should not be applied; 2, acute or chronic hepatitis or nephritis; 3, malignant tumors, precancerous lesions; 4, endocrine diseases (such as diabetes mellitus, hyperthyroidism, etc.); 5, lactation is not suitable for use; 6, age greater than 35 years of age of women smokers who take contraceptives, can increase the incidence of cardiovascular The incidence of cardiovascular disease, should not be taken for a long time; 7, psychiatric patients; 8, with severe migraine, repeated occurrence of the author should not. Side effects of oral contraceptives and treatment: 1, early pregnancy-like reaction. The first time the person who takes the pill can have early pregnancy reaction such as loss of appetite, nausea, vomiting, fatigue, dizziness, etc. Generally, there is no need for special treatment, and it can disappear naturally after several cycles of taking the pill, but the person with serious symptoms should stop taking the pill or change to other preparations or change to other measures. Irregular vaginal bleeding. Most of the time, it occurs after taking contraceptive pills. If the bleeding is not treated, it can be gradually reduced to stop with the prolongation of time; if the amount is large, estrogen can be added every night until the drug is stopped; if the bleeding is similar to the amount of menstruation or the time is close to the menstrual period, the drug should be stopped, and the menstrual cycle should be done once. Start the next cycle of medication on the 5th day of bleeding. 3. Amenorrhea. Amenorrhea can occur in about 1%-2% of women, and it mostly occurs in patients with irregular menstruation, so patients with irregular menstruation should be careful with the use of contraceptive pills. If menstruation does not occur after stopping the pill, it is necessary to exclude pregnancy and continue to take the pill for 7 days after stopping the pill; if menstruation stops for 3 months in a row, it is necessary to go to the hospital in time. 4, weight and skin changes. A few patients may experience weight gain and skin pigmentation. 5.Other. Individual women may have headache, breast swelling and pain after taking the drug, which can be treated symptomatically, and if necessary, stop the drug for further examination. It should be noted here that there is evidence that pregnancy does not increase the incidence of fetal malformations after discontinuation of compound short-acting oral contraceptives. Because of its low hormone content, pregnancy can be achieved after stopping the pill, without affecting the growth and development of the offspring; while the hormone content and dose of long-term contraceptive pills are very different from that of short-acting ones, and thus it is appropriate to have a pregnancy six months after stopping the pill.