Birth control pills are used for contraception, treatment of dysmenorrhea, and treatment of menstrual irregularities. Contraceptive pills can inhibit ovulation, inhibit the formation of fertilized eggs, and interfere with the implantation of fertilized eggs. Different types of contraceptive pills have different side effects. Long-acting contraceptive pills are prone to cause adverse reactions such as irregular menstruation and obesity in those who take them because they contain large doses of hormones. Emergency contraceptive pills contain large amounts of progesterone, which can interfere with normal endocrine, leading to symptoms such as menstrual cycle disorders and irregular vaginal bleeding. If used repeatedly over a long period of time, it may cause menstrual disorders, amenorrhea, or even infertility and other conditions, posing a serious health hazard. Short-acting contraceptives contain low levels of estrogen and progesterone and have fewer side effects. Side effects such as nausea, vomiting, and body weakness may occur, as well as irregular vaginal bleeding, amenorrhea, breast swelling and pain, weight gain, and facial hyperpigmentation. Long-term use of short-acting contraceptives can increase the incidence of cardiovascular disease. Those who need to take it should not buy and take the drug on their own, and are advised to go to a regular medical institution and use the drug reasonably under the guidance of a doctor to avoid adverse reactions.