How effective is Plan B?

The morning-after pill Plan B is most effective (>97%) when taken within 24 hours of unprotected sex and 75%-89% effective if you take it within three days.
Taking Plan B at the appropriate time after unprotected intercourse can help prevent unwanted pregnancies.

Plan B Emergency Contraception, NYS Approved OB/GYN, Brooklyn, NYC

How Does Plan B Work, and Is It Always Effective?

Emergency contraception pill Plan B is 30% more effective when taken with this drug, new research shows

Does Plan B Expire? What to Know About Shelf Life and Storage

Effective PLAN B COST Pills T-Shirt by After Pill - Fine Art America

Plan B (Morning After Pill): 15 Effects and Effectiveness Facts – EverCup

Take Action vs. Plan B Compared: Which is Better?

Plan B might be less effective for women over a certain weight, but it's not worthless.

Is Plan B less effective in people who weigh more than 165lbs?

Ask the Expert: Plan B