The harm of emergency contraceptive pill levonorgestrel mainly comes from the effect of endocrine function, damage of liver function, and the effect of blood lipid and blood sugar metabolism. I. Occasional use of the emergency contraceptive pill may cause irregular bleeding in the vagina or menstrual disorders for a short period of time. However, this symptom lasts for a relatively short time and usually returns to normal on its own. If you take the emergency contraceptive pill many times in a short period of time, it may cause serious disorder of ovarian endocrine function, resulting in menstrual disorders, abnormal ovulation function and even failure to conceive normally. Third, frequent use of emergency contraceptive pills may cause drug-related liver damage, resulting in abnormal liver function. Fourth, because it affects the metabolism of blood lipids and blood sugar in the body, it may lead to the increased incidence of hyperlipidemia, thromboembolic disease, diabetes and other diseases.