5 doctors weighed in:

How well does emergency contraception work to prevent pregnancy?

5 doctors weighed in
Dr. Richard Chudacoff
Obstetrics & Gynecology
2 doctors agree

In brief: 89 %

Plan b or emergency hormonal contraception is almost 90% effective if it is used within 72 hours of intercourse, and there has only been one ejaculation in that time frame.

In brief: 89 %

Plan b or emergency hormonal contraception is almost 90% effective if it is used within 72 hours of intercourse, and there has only been one ejaculation in that time frame.
Dr. Richard Chudacoff
Dr. Richard Chudacoff
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Dr. Marianna Post
Family Medicine
1 doctor agrees

In brief: Not well

It doesn't work that well, you still have at least 27% chance to get pregnant, that is why it is an emergency contraception, when there is nothing else you can do.
So by no means it should be used as regular contraceptive method, there are methods of contraception that are safer and more effective if you use them before not after the occurrence.

In brief: Not well

It doesn't work that well, you still have at least 27% chance to get pregnant, that is why it is an emergency contraception, when there is nothing else you can do.
So by no means it should be used as regular contraceptive method, there are methods of contraception that are safer and more effective if you use them before not after the occurrence.
Dr. Marianna Post
Dr. Marianna Post
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Dr. Heidi Fowler
Psychiatry

In brief: It can be very

effective depending on when it is taken.
Here is an example > 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.

In brief: It can be very

effective depending on when it is taken.
Here is an example > 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.
Dr. Heidi Fowler
Dr. Heidi Fowler
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