What is the effectiveness of emergency contraception pills (ECP)?

The effectiveness of emergency contraception pills (ECP) is most accurately reflected in the understanding that they can reduce the risk of pregnancy by at least 75%. ECPs, when taken within the appropriate time frame after unprotected intercourse, significantly decrease the likelihood of ovulation or fertilization.

Research shows that these medications are most effective when taken as soon as possible after the event, ideally within 72 hours, although some types can be effective up to 5 days later. The 75% effectiveness rate indicates a substantial reduction in the probability of pregnancy, but it does not guarantee complete prevention. The higher percentages associated with options reflecting greater effectiveness, such as 90% and 95%, overstate the actual effectiveness according to current clinical guidelines and studies.

By understanding these effectiveness statistics, individuals can make informed decisions regarding their reproductive health options following potential contraceptive failures or unprotected intercourse.