Fast-acting contraceptive pills, also known as emergency contraceptive pills, are highly effective progestin, which is damaging to the patient’s body, and it is recommended to take it up to three times a year and once a month at most, so that this damage can be minimized and will not cause long-term effects. If taken too often or if you are too sensitive to the drug, taking emergency contraceptives may cause the following hazards: First, taking emergency contraceptives may cause unwanted pregnancy or ectopic pregnancy, because the contraceptive rate of emergency contraceptives is only about 80%, and it will disturb the peristalsis of the fallopian tube, which may cause tubal pregnancy. Secondly, it may cause mental abnormalities, such as irritability or depression, so it is prohibited for patients with mental illness. Thirdly, it may cause blood clots or damage to liver and kidney functions, so it is not recommended for patients with serious liver and kidney diseases, hypertension, or abnormal coagulation function.