Emergency contraceptive pills have a lot of side effects and should not be taken more than three times a year and at most once a month. If you take the pill three times in a year, it will cause side effects: 1. endocrine disorders in the body, the emergency contraceptive pill contains a lot of progesterone, after taking it, it will cause endocrine disorders, resulting in irregular vaginal bleeding, taking the emergency contraceptive pill once will usually affect the menstrual cycle for three months. 2. irritation of the gastrointestinal tract, after taking the pill, there will be nausea, vomiting and other symptoms of the digestive tract. It can be recommended to take it before bedtime to reduce the adverse reactions. 3, after taking emergency contraceptive pills can aggravate breast diseases, progesterone will stimulate the breast gland, thus leading to the aggravation of breast diseases, so patients suffering from severe breast hyperplasia are not recommended to take contraceptive pills that are contraindicated. 4, other adverse reactions, such as facial spots, increased leucorrhea, etc. It is best for women to take contraceptive measures that suit them, and never use the emergency contraceptive pill as a regular method of contraception.