Emergency contraceptive pills can be taken over 40 years old, generally within 72 hours after intercourse are effective, but note that the emergency contraceptive pill is very harmful, especially for women over 40 years old ovarian function has gradually weakened, it is recommended to use caution, try not to take the pill. For emergency contraceptive pills do not take more than 3 times in a year, more than 3 times has a great impact on the body. After taking the emergency contraceptive pill, menstrual disorders and even amenorrhea may occur, as well as irregular vaginal bleeding before and after menstruation, and other systemic injuries, such as nausea, vomiting and diarrhea in the digestive system, which should be observed. In addition, the effect of emergency contraceptive pill is poor compared to the general conventional contraceptive measures.