What is the timeframe for administering Levonorgestrel as a form of emergency contraception?

Levonorgestrel is an effective form of emergency contraception that works by preventing or delaying ovulation when taken after unprotected intercourse. The optimal timeframe for its administration is within 72 hours (3 days) of the incident. However, it can be used up to 120 hours (5 days) after unprotected sex, but its efficacy decreases significantly with time.

Choosing the option that encompasses the 3-4 day window is appropriate when considering that it is ideal to take Levonorgestrel as soon as possible after unprotected intercourse to increase its effectiveness. After the 4-day mark, the likelihood of preventing pregnancy decreases, but the medication is still considered to have some effectiveness right up until the 5 days, making the described timeframe relevant in the discussion of when it is actionable and effective.

While the medication is indicated for use up to 5 days, its strongest efficacy occurs within the first 3 days, which ideally aligns with the choice indicating a timeframe that begins to include the lower side of effectiveness. This understanding of both the optimal usage timeframe and the decreasing efficacy underscores the significance of timely administration in emergency contraception protocols.