What is the maximum duration for the administration of Emergency Contraception after unprotected sex?

Emergency contraception, specifically products such as ulipristal acetate (Plan B One-Step and its generics), can be taken up to 120 hours (5 days) after unprotected intercourse to effectively reduce the risk of pregnancy. This option is designed to work by delaying or inhibiting ovulation, which is crucial in preventing fertilization.

While some emergency contraceptive methods, like levonorgestrel (Plan B), are most effective when taken within 72 hours after unprotected sex, they can still be taken within the 120-hour window, albeit with decreasing efficacy. The distinction is significant in clinical practice, as it informs individuals about the time frame in which these medications can still provide protection.

In contrast, the other choices indicate durations that are either shorter or longer than the scientifically supported time frame. Most healthcare providers emphasize the 120-hour guideline to ensure patients understand they have more time to access emergency contraception than previously thought.