Use up to 72 hours after unprotected sex.

Levonorgestrel is a generic type of emergency contraception that’s to be used within 72 hours of unprotected sex.
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Levonorgestrel is a type of emergency contraception that comes in the form of a tablet. It’s to be taken within 72 hours of having unprotected sex. It will prevent 84% of expected pregnancies but it’s more effective the earlier you take it, especially within 12 hours.
Emergency contraception, or the morning-after pill, is a type of birth control taken after sexual intercourse to prevent pregnancy. It is best to use regular birth control methods, like the combined pill or IUDs, or condoms as this is more effective than emergency contraception. Levonorgestrel also won’t protect you from sexually transmitted infections (STIs). Condoms are the best way to protect both partners from STIs.
The Levonorgestrel Tablet uses a synthetic progestogen hormone called levonorgestrel. This active ingredient works in multiple ways. It stops or delays your ovaries from releasing an egg, prevents any sperm from fertilising any released eggs, and may also change the lining of the uterus so any fertilised egg won’t develop.
It’s advised that you take it as soon as possible after unprotected sex. You have a window of 12-72 hours for Levonorgestrel to be the most effective.
A Levonorgestrel tablet contains 1.5mg of levonorgestrel, and it’s a single treatment. Some doctors may recommend two doses of 0.75mg, taken 12 hours apart. This method is just as effective as taking one dose.
How we source info.
When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.
You should only take Levonorgestrel if you’ve had unprotected intercourse, if the condom you used broke, or if you forgot to take your contraceptive pill when you were supposed to. It won’t work if you’re already pregnant, and shouldn’t be used as regular birth control.
Our clinicians will advise you on the best way to take Levonorgestrel. If you have any further questions or concerns, they would be happy to answer them.
Levonorgestrel tablets are more effective the earlier you take them. Results from clinical studies show that when Levonorgestrel was taken within 72 hours of unprotected sex, it prevented 85-97% of expected pregnancies.
You’ll know if it has worked when you receive your next period, but you should still take a pregnancy test to know for sure if you’re pregnant or not.
The packet will only contain one tablet, so there shouldn’t be a risk of an overdose. There have also been no reports of serious side effects from taking too many. You may feel sick or have irregular bleeding. If you have vomited after taking Levonorgestrel, report it to your clinician as soon as possible; it may not have worked, and you might need to take another one.
How we source info.
When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.
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Disclaimer: The information provided on this page is not a substitute for professional medical advice, diagnosis, or treatment. If you have any questions or concerns about your health, please talk to a doctor.
Package leaflet, Levonorgestrel 1.5mg Tablets, Lupin Healthcare (UK) Ltd.
National Library of Medicine, MedlinePlus, Levonorgestrel.
“Levonorgestrel-only dosing strategies for emergency contraception.” Pharmacotherapy vol. 27,2 (2007): 278-84.
Low dose mifepristone and two regimens of levonorgestrel for emergency contraception: a WHO multicentre randomised trial. The Lancet Volume 360, Issue 9348, 7 December 2002, Pages 1803-1810.
Summary of Product Characteristics, Levonorgestrel 1.5mg Tablets, Lupin Healthcare (UK) Ltd.
NHS, Emergency contraception (morning after pill, IUD), Your contraception guide.
“Levonorgestrel emergency contraception and bodyweight.” Current medical research and opinion vol. 35,7 (2019): 1149-1155.
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