How Long Is Plan B Effective For

How Long Is Plan B Effective For
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Plan B One-Step should be taken within 72 hours of unprotected intercourse. When taken within 72 hours , it decreases the chance of getting pregnant by 89%. It’s even more effective when taken within 24 hours . Effectiveness decreases the longer a woman waits to take it.
How long should you wait before taking Plan B? Plan B One-Step should be taken within 72 hours of unprotected intercourse. When taken within 72 hours, it decreases the chance of getting pregnant by 89%. It’s even more effective when taken within 24 hours. Effectiveness decreases the longer a woman waits to take it.
Is Plan B effective after 72 hours? Based on available data, Plan B is most effective if taken within the first 72 hours after unprotected sex but is still somewhat effective up to 5 days (120 hours) after unprotected sex. As mentioned, the sooner you take Plan B, the better.
What are the side effects of Plan B and how long do they last? Plan B (levonorgestrel, morning after pills, day after pills, post coital contraception, day after contraception, Next Choice) side effects are generally minor with most of them going away in one to two days . There are no long term side effects with the use of Plan B as an Emergency Contraceptive method.
How long does the bleeding last after taking Plan B? Heavy bleeding seven days, 5 or 4 days after taking plan B is considered normal. The bleeding is occasioned by the shedding of your uterine lining, which is exactly what plan B was designed to do.
How long should you wait before taking Plan B? Plan B One-Step should be taken within 72 hours of unprotected intercourse. When taken within 72 hours, it decreases the chance of getting pregnant by 89%. It’s even more effective when taken within 24 hours. Effectiveness decreases the longer a woman waits to take it.
What happens if you take Plan B too late? What are the risks of Plan B. Plan B uses a synthetic hormone traditionally used in birth control pills. The dosage is high, but serious side effects are uncommon. Typical and expected side effects include vomiting, nausea, fatigue, diarrhea and menstrual irregularities . If your period is more than seven days late,…
How long does Plan B last after you take it? “plan b” can stay in your system for up to five days , though it is not effective after three days max. If you have taken it, anticipate an irregular period afterwards. This is typical.
Should I get my period soon after taking Plan B? Women who took Plan B within 1-2 days before or after ovulation started their periods when they expected them. Women who took an emergency contraceptive more than two days before ovulation got their period at least one day earlier than usual.
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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.

Ashley Laderer is a freelance writer from New York who specializes in health and wellness. Follow her on Twitter @ashladerer

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Plan B has a 95% chance of preventing pregnancy if you take it within 24 hours. If you take it within 72 hours, your chances reduce to 89% .
Note: Plan B, sometimes referred to as the "morning-after pill," is an over-the-counter form of emergency contraception you can take to prevent pregnancy after having unprotected sex.
"Plan B is FDA approved for use up to 72 hours after unprotected sex. It can be used up to 120 hours after, but the further out from intercourse, the less effective it will become," Nicole M. Bender , MD, an OB-GYN at Keck School of Medicine of USC.
So, for max protection, take the pill as quickly as you can get it.
The active ingredient in Plan B that prevents pregnancy is a hormone called levonorgestrel, which is a synthetic version of progesterone.
Aileen Gariepy, MD , OB-GYN at Yale Medicine and associate professor at Yale School of Medicine says that levonorgestrel works to prevent pregnancy by:
Plan B won't work if a pregnancy has already been established, says Gariepy. The only way to know for sure if you're pregnant is to take a pregnancy test . However, you can also look out for early pregnancy symptoms like a missed period, nausea, vomiting, or sore breasts.
Note: Taking more than one dose of Plan B after an act of unprotected sex will not make it more effective, Gariepy says.
Additionally, if you've ovulated recently, some research indicates that Plan B does not work as well .
Ovulation typically occurs right in the middle of your menstrual cycle, such as on day 14 if you have a 28 day cycle. You might also notice clear and stretchy vaginal discharge. To be extra sure, you can purchase over-the-counter ovulation strips to determine if you're ovulating.
Note: Plan B is different from an abortion pill, and it will not terminate an existing pregnancy.
Plan B starts working soon after taking the pill. Peak levels of Plan B in your bloodstream will occur about 1.7 hours after taking the pill .
Depending on where you are in your cycle, Plan B will likely delay ovulation for a few days, says Gariepy. And the levonorgestrel should leave your system after about a week or so, depending on how fast your metabolism is, Gariepy says.
However, it's important to note that plan B only works for the episode of unprotected sex you have already had. If you have unprotected sex shortly after taking plan B — like later that day or the following day — then you will need to take another dose of plan B to prevent pregnancy.
Plan B may cause side effects, which Gariepy says are most likely to occur within a few hours of taking the pill, since the peak levels in your blood will be around 1.7 hours after. Side effects will usually resolve within 24 hours and include :
Be aware that there is a risk Plan B might not work for you if you fall into one of the following groups.
Note : A prescription emergency contraception called Ella, is more effective in women who weigh 155 pounds or more. Ella can be used up to 120 hours after unprotected sex, though it's more effective the sooner you take it.
Medicines you should not take with plan B
Some medications may interact with Plan B, making it less effective, since they can decrease the amount of levonorgestrel in the blood . These medications include :
For a full list of medications, visit Plan B One-step's website here .
Plan B is a type of emergency contraception that is very effective at preventing pregnancy if you take it within 24 hours of unprotected sex. The longer you wait to take it, the less effective it becomes.
Plan B is not a substitute for

birth control

. It's meant for emergencies, not to be taken regularly. "Plan B is a great back-up plan — meaning it's not meant to be someone's first line of defense against pregnancy," says Gariepy.

Johanna Barclay
August 16, 2016, 6:04 pm

“Plan B” is a brand name birth control formulation manufactured in tablets, each of which contains 0.75 mg of the active steroid levonorgestrel. Levonorgestrel is an entirely synthetic progestogen that was synthesized in the 1960s and was included in birth control products by the 1980s. The levonorgestrel within Plan B functions by inhibiting ovulation or fertilization by modifying tubal transport of sperm and/or ova.
Some speculate that it may also decrease endometrial receptivity to the implantation of a fertilized egg. Though administration of Plan B is not regarded as a clinically effective intervention post-uterine implantation, it is suggested to work for up to 72 hours following unprotected sex. In the United States, Plan B is ubiquitously available as an over-the-counter emergency contraceptive for those over the age of 16, and was used by 11% of sexually active women between the years 2006 and 2010.
As a result of its efficacy and popularity, it is regarded as an “essential medicine” by the World Health Organization (WHO). Though an incredibly useful and practical medication, Plan B can provoke unwanted side effects such as: breast tenderness, headaches, menstrual irregularities, and nausea. The combination of lingering side effects along with general curiosity has lead many women to ask how long “Plan B” stays in their system after taking it.
To determine how long “Plan B” is likely to stay in your system, it is necessary to examine the elimination half-life of its principal ingredient Levonorgestrel. Levonorgestrel is reported to have an elimination half-life of 24.4 hours (+/- 5.3 hours). This indicates that the average Plan B user will have eliminated 50% of the dosage from systemic circulation in just over a day after ingestion.
Knowing the average half-life of 24.4 hours, we can estimate that it’ll take around 5.59 days to completely clear a single Plan B dose from your system. However, research has suggested that there’s an approximate 5.3 hour deviation in elimination half-life among most users. This indicates that some users may exhibit half-lives closer to 19.1 hours, while others may exhibit half-lives closer to 29.7 hours.
Those with faster elimination half-lives of 19.1 hours could clear Plan B from their systems within 4.38 days, while those with slower elimination half-lives could eliminate Plan B within 6.81 days. In other words, most people taking Plan B will have eliminated the levonorgestrel from systemic circulation within a week after single-dose administration. Sources other than the Plan B product labeling suggest that the elimination half-life may be slightly longer than 24.4 hours.
Independent research has suggested an elimination half-life of 28 hours (+/- 6.4 hours) and other evidence suggests that from steady state concentrations, 36 hours (+/- 13 hours) may be more accurate. From the 28 hour half-life with the (+/-) 6.4 hour deviations, we could estimate that elimination may take 6.42 days (on average), but possibly sooner in 4.95 days or later in 7.88 days. If steady state concentrations were attained, average elimination could take 8.25 days (on average), but possibly less time (5.27 days) or a much longer duration (11.23 days).
Most users of Plan B should therefore conclude that the drug is unlikely to still be in their systems after 2 full weeks. Even in the extreme cases of users experiencing a prolonged elimination half-life of 49 hours, the drug should have been eliminated in under 12 days. In summary, most Plan B users will have eliminated the synthetic hormone within 1 week.
Though Plan B’s labeling indicates that most individuals should eliminate the levonorgestrel from their system in 5.59 days (on average), it does suggest that there is usually some variation in half-life. When contemplating whether Plan B is likely to stay in your system for a shorter or longer duration than average, it is necessary to consider some variables. Variables that in
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