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A 49-year-old male asked:

how effective is plan b if took on day 3?

2 doctor answers4 doctors weighed in
Dr. Jeffrey Juchau
Family Medicine 33 years experience
Plan B: is most effective when taken within the first 24 hours of intercourse and loses some effectiveness the further out it is taken. It is still effective 72 hours from intercourse.
Dr. Heidi Fowler
Psychiatry 25 years experience
Up to 89%: 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.

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Similar questions

TX
A 20-year-old member asked:

What does it mean when you take Plan B and you spot lightly the next day?

2 doctor answers7 doctors weighed in
Dr. Marianne DiNapoli
Dr. Marianne DiNapolianswered
Obstetrics and Gynecology 8 years experience
Difficult to say: One of the side effects of Plan B is abnormal bleeding, so it is possible that the spotting is from the medication. Remember that Plan B only decreases your chances of unintended pregnancy by half. Just because you have some spotting does not mean you are not pregnant, so you might consider taking a home pregnancy test and see your physician as soon as possible.
A member asked:

If i took planb within 72 hours but i only spotted for an hour & then a spot for a couple days. Am i safe? I'm worried because it was barely anything

2 doctor answers3 doctors weighed in
Dr. Nadini Verma
Specializes in Gynecology
Can happen: If you are spotting occasionally following Plan B this can happen , however if you have skipped a period or have just this scant spotting instead of your period , please do a pregnancy test.
A 25-year-old female asked:

Does Plan B work 4 days later?

2 doctor answers3 doctors weighed in
Dr. Jane Van Dis
Obstetrics and Gynecology 18 years experience
Yes, but diminishing: Studies have shown that women can still benefit from using Plan B as late as 4 days after unprotected sex. It's better than not using is you're worried about pregnancy. The sooner you take Plan B after unprotected intercourse, the better, but taking it is better than not! hope that helps!
AL
A 17-year-old female asked about a 16-year-old female:

What are the chance Plan B would work if i took it 4 days later?

1 doctor answer1 doctor weighed in
Dr. Heidi Fowler
Psychiatry 25 years experience
Decreased: 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.
MS
A 19-year-old female asked:

How reliable is the pill Plan B after two days?

2 doctor answers2 doctors weighed in
Dr. Oscar Novick
Pediatrics 58 years experience
Reliability: Plan b is effective for up to five days or 120 hours.

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Last updated Nov 19, 2014
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