Levonorgestrel tablets should be taken as early as possible within 72 hours after unprotected sexual intercourse or contraceptive method failure, take the first tablet as early as possible within 72 hours after the first tablet, take the second tablet 12 to 16 hours after the first tablet, and should be used in consultation with a physician for guidance. Levonorgestrel tablets are progestogen-based emergency contraceptives, mainly used for emergency contraception in women, used orally, take the first tablet as early as possible within 72 hours after unprotected sexual intercourse or contraceptive method failure, and take the second tablet 12 to 16 hours after the first tablet is taken. This product is an emergency remedial contraceptive used for contraceptive errors, not induced abortion; adverse reactions can be seen mild nausea, vomiting, breast tenderness, headache, dizziness, fatigue and other symptoms; generally do not need to be dealt with, and can be resolved after 24 hours. There are some contraindications to the use of the drug, which should be taken seriously. It is prohibited for those who are allergic to levonorgestrel or any other ingredients; it is also prohibited for pregnant women and lactating women, and for children under 16 years of age. In the use of medication, must follow the doctor’s instructions, rational application of drugs, do not use drugs at will, to avoid causing serious side effects and adverse reactions.