A member asked:

Is plan b is effective at any unprotected sex?

A doctor has provided 1 answer
Dr. Heidi Fowler answered

Specializes in Psychiatry

It must be used with: in a particular time frame. Plan B One-Step is up to 89 % effective when taken within 72 hours (3 days) after unprotected sex. It can reduce chance of pregnancy by up to 95% if used within 24 hours. It continues to reduce the risk of pregnancy up to 120 hours (5 days) after unprotected sex, but is less effective as time passes.

Answered 6/3/2017

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