Emergency contraceptive pills are also called levonorgestrel tablets. Levonorgestrel tablets are potentially harmful when taken 5 times a month. Levonorgestrel tablets should not be used as a regular contraceptive and frequent use is not recommended. Frequent use may increase the incidence of adverse reactions. If severe discomfort occurs after frequent use, patients are advised to go to the hospital in time. Levonorgestrel tablets are generally used for emergency contraception in women, i.e. when unprotected or other contraceptive methods fail by chance. Adverse reactions such as irregular menstruation, nausea, vomiting, breast swelling, headache and abnormal uterine bleeding may occur after use. If used frequently, the incidence of adverse reactions may be increased. If irregular uterine bleeding or severe lower abdominal pain occurs after the use of levonorgestrel tablets, patients should go to the hospital for timely examination. If the drug is needed, patients are advised to use it properly under the guidance of a doctor.