A member asked:

Can you tell me how affective is plan b one-step?

A doctor has provided 1 answer
Dr. Heidi Fowler answered

Specializes in Psychiatry

Plan B: 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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Related Questions

A member asked:

Is Plan B one step still effective if taken 1 day after the 3 day margin?

6 doctors weighed in across 2 answers