Oral contraceptive pills are divided into short-acting, long-acting and emergency contraceptive pills. The main ingredients of long-acting contraceptive pill are large doses of progestin and estrogen, taking long-acting contraceptive pill will cause some adverse reactions, the common side effects mainly include: a. The normal endocrine function of ovaries is disturbed due to the influence of the drug, which may lead to increased menstruation, prolonged menstruation or amenorrhea; b. Symptoms similar to early pregnancy reaction will appear after taking the pill, such as nausea, vomiting, aversion to greasy Some patients may experience increased vaginal discharge after taking long-acting contraceptive pills for 3-6 months; iv. Short-acting contraceptive pills are generally less harmful and can also play a role in adjusting the menstrual cycle. However, it is recommended that contraceptive drugs should not be taken for a long time, as it will increase the probability of developing uterine fibroids and tumors of the reproductive system. It is better to use condoms for contraception or to use safer and more effective methods such as IUDs and ligation. Emergency contraceptive pills are generally the most harmful to the body, so do not take them in non-special circumstances and do not take them several times in a short period of time.