The duration of emergency contraceptive pill side effects is related to the patient’s physical condition, the type of medication used and other factors, and may generally last for 2-3 months. The emergency contraceptive pill is a contraceptive remedy that needs to be taken within 72 hours after unprotected sex. Since the emergency contraceptive pill is a highly effective progestogen, it may cause significant side effects even if taken once in a while, such as causing endocrine disruption, withdrawal bleeding or menstrual irregularities, etc. It usually takes about 2-3 months to return to normal. It should be noted that the emergency contraceptive pill should not be taken more than 3 times in a year and should not be used as a regular means of contraception to avoid endocrine disruption and may even cause amenorrhea and difficulties in pregnancy. For the sake of women’s health, it is not recommended to use the pill for a long time to avoid endocrine disruption, so it is necessary to take good contraceptive measures when having sex, such as using condoms and contraceptive plugs.