Plan B Weight

Plan B Weight

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This article was medically reviewed by Lauren Demosthenes, MD, OB-GYN, senior medical director at Babyscripts .

Our stories are reviewed by medical professionals to ensure you get the most accurate and useful information about your health and wellness. For more information, visit our medical review board.

Ava English is a freelance health writer. She is currently pursuing a master’s degree in science writing and editing. You can follow her on Twitter .

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Emergency contraceptives, like the morning after pill, can help prevent pregnancy even after you've had unprotected sex. However, research indicates these morning-after pills may not be effective for those who are above a certain weight.
There are three main types of emergency contraception, each of which is influenced by weight differently:
Here's what you need to know about weight limits when using emergency contraception, and what other options may be available to you.
Plan B may be less effective if you weigh more than 155 lb or have a BMI over 25 .
Some researchers believe that weight and BMI — which stands for body mass index — alters the effectiveness of Plan B because those with more fat cells metabolize drugs differently than people with lower fat stores, says Rachel Bowman , MD, an assistant professor at The University of Texas Austin Dell Medical School.
"However, this research is limited and not well explored," Bowman says.
It's still unclear as to whether morning-after pills are less effective for people above a certain weight, as the research has presented mixed results.
Here's a survey of what scientific research has indicated:
Even if you are above the recommended weight limit for Plan B, you can still take it.
"There are really no medical contraindications to taking emergency contraceptives, and the benefit to them is potentially higher than any potential risks — pregnancy could be a much riskier state than taking a single dose of either medication," says Staci Tanouye , MD a gynecologist based in Jacksonville, Florida.
Although Plan B is safe and there are no serious or long-term side effects, some people may experience short-term side effects, says Bowman.
There are other emergency contraception options that can be more effective than Plan B, especially if you are over 155 lbs.
General advice: The copper IUD is the best emergency contraceptive option for women above a BMI of 35. "BMI does not alter the effectiveness of the copper IUD," says Simon.
Here's a breakdown of the different emergency contraception options, and which is best for you based on your weight.
Not effective for women with a BMI over 25
75%-89% effective and protects against pregnancy for 72 hours after unprotected sex. It's best to take it as soon as possible.
Not as effective for women with BMI over 35.
85% effective when taken within 5 days after unprotected sex. It is most effective if taken as soon as possible.
More than 99% effective. Protects against pregnancy if inserted within 5 days after unprotected sex.
Plan B has a weight limit of 155 lbs, but it's still safe to take morning-after pills even if you fall above the recommended weight limit. Although there's a chance they might not be as effective, it's not likely to pose any health risks.
When it comes to emergency contraception options, the IUD is the most effective option for people of all weights. The best advice is to communicate with your gynecologist or healthcare provider to determine which contraceptive option is right for you.

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Plan B and Plan B One Step are emergency contraceptives intended to reduce the possibility of pregnancy following unprotected sexual intercourse or a known or suspected contraceptive failure, such as a condom breakage.
The FDA has completed a review of available scientific data concerning the effectiveness of levonorgestrel (LNG) emergency contraceptives (ECs) in women who weigh more than 165 pounds or have a body mass index (BMI) above 25 kg/m 2 . The data are conflicting and too limited to reach a definitive conclusion as to whether effectiveness is reduced in this group. The FDA does not believe that a change in the labeling for LNG EC products is warranted at this time. There are no safety concerns that preclude use of LNG ECs in women generally, and the FDA continues to believe that all women, regardless of how much they weigh, can use these products to prevent unintended pregnancy following unprotected sexual intercourse or contraceptive failure. The most important factor affecting how well emergency contraception works is how quickly it is taken after unprotected sex.
Given that the currently available data are inconclusive, the FDA believes further research by the manufacturers of these products on the possible impact of weight or BMI on effectiveness should be a priority.
The FDA will continue to monitor and review information on these products as it becomes available and will communicate to the public as needed. Consumers and health care professionals are encouraged to report adverse reactions from the use of LNG ECs to the FDA’s MedWatch Adverse Event Reporting program at www.fda.gov/MedWatch or by calling 1-800-FDA-1088.
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