What is the effectiveness rate of Plan B as an emergency contraceptive?

Plan B, also known as the morning-after pill, is an emergency contraceptive designed to prevent pregnancy after unprotected intercourse or contraceptive failure. The effectiveness rate of Plan B is approximately 85% when taken within 72 hours after the event. This statistic indicates that while Plan B significantly reduces the risk of pregnancy, it is not foolproof and does not guarantee prevention in all cases.

The percentage reflects how effective the medication is based on various studies and clinical trials. When taken sooner—ideally within 24 hours—its effectiveness can be slightly higher, but the maximum reported effectiveness peaks at around 85% for its intended usage window. This means that one in seven women may still become pregnant despite using Plan B within the recommended time frame.

Understanding the effectiveness range is important for patients and healthcare providers, as this information helps in assessing the best strategies for contraceptive use and managing expectations in case of contraceptive failure. It also highlights the importance of following up with a healthcare provider if menstruation is delayed beyond the expected time.