How effective is Plan B one step after 5 days of unprotected sex?

Not very. 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.

Related Questions

If you take Plan B one step 3 hrs before unprotected sex are you still protected? & is it still effective?

Probably but why? . This seems like backward thinking. Use over the counter Plan B if ontercourse was within 72 hours to decrease the risk of unplanned pregnancy. It is a backup for when you make a mistake and have sex without birth control or condoms. Make good choices and avoid mistakes. Use condoms & start birth control. Avoid mistakes in life before they happen. This is true in all aspects of life not just sex. Read more...
Yes. Yes it will likely work. It is always possible for any emergency contraceptive not to work. Read more...