Taking emergency contraceptive pills can have side effects such as nausea, menstrual disorders, vaginal bleeding, etc., which usually disappear completely within 3 months, but the elimination time varies with different symptoms. 1. Nausea: After taking emergency contraceptive pills, some women may experience gastrointestinal side effects such as nausea and vomiting, and these symptoms are usually eliminated within 1 week. 2. Menstrual disorders: taking emergency contraceptive pills may cause endocrine disorders in some women, leading to menstrual disorders. The symptoms of menstrual disorders usually return to normal within 2-3 months. 3. Vaginal bleeding: If women experience vaginal bleeding after taking emergency contraceptive pills, it may be withdrawal bleeding, usually not more than 5 days. Emergency contraceptive pills need to be used under the guidance of a doctor, and should be taken within 72 hours after unprotected sex, heart, liver and kidney insufficiency patients are prohibited emergency contraceptive pills, and it should be noted that emergency contraceptive pills can not be taken for a long time. Once abnormal symptoms occur after taking the emergency contraceptive pill, you should consult a doctor in time.