The effects of emergency contraceptive pills on the human body mainly include the following aspects: 1, the effect on menstruation, may lead to menstrual changes, such as no menstruation or menstrual dribbling, irregular menstrual cycles; 2, some people taking emergency contraceptive pills, due to the large content of hormones, on the liver and kidneys may have an impact on the metabolism, and even serious may have an impact on the ovaries. If you take emergency contraceptive pills, irregular vaginal bleeding, menstrual changes, etc., must go to the hospital to find a specialist for diagnosis.