The composition of the contraceptive film is mainly nonyl phenyl ether, which can prevent sperm from entering the uterine cavity, thus preventing the combination of sperm and egg cells and achieving contraceptive effect. It is relatively reliable. Contraceptive film can prevent sperm from entering the uterine cavity, but also change the permeability of the sperm cell membrane, so that the sperm is inactive, to avoid the combination of sperm and egg cells, so as to achieve contraceptive effect, so the correct use of its effect is relatively reliable. Contraceptive film is a kind of external contraceptive, women in 10 minutes before intercourse, the contraceptive film will be folded twice or kneaded into a ball, put into the deep vagina, 10 minutes after intercourse. If you do not have intercourse within 30 minutes of placing it in the vagina, you must put it in again when you have intercourse again, and if you repeat intercourse, you need to put it in again. The maximum dosage is not more than two at a time. However, it should be noted that the use of allergic reactions such as local itching, pain, etc. may occur, and a small number of patients may experience mild local irritation symptoms and increased vaginal discharge. It is contraindicated for those suspected of having malignant tumors of the reproductive tract and irregular vaginal bleeding. Only the correct use of this contraceptive diaphragm into the deep vagina can achieve contraceptive effect, otherwise it may lead to contraceptive failure. The use of the diaphragm does not prevent the spread of diseases. Some sexually transmitted diseases, such as AIDS, do not achieve the purpose of blocking the spread of diseases through the use of the diaphragm. The use of the diaphragm is not recommended for people at risk of STD transmission.