It can prevent pregnancy if taken within 72 hours and preferably within 12 hours of unprotected sex. Temporary side effects, however, may occur and usually pass within 24 hours.
The most common side effects include nausea, abdominal pain, fatigue, headache, dizziness, breast tenderness, vomiting, diarrhea, and irregular menstrual bleeding. Less common reactions are migraine or severe headache, lower abdominal pain, painful menstruation, and vaginal discharge.
If your period is more than a week late or if these symptoms continue for more than 48 hours or are severe, see a healthcare professional. Be sure to contact a healthcare professional immediately if you experience any of the following serious side effects: itching and rash, cramping or severe pain in your stomach or belly before your next normal period, uterine hemorrhage, vaginal hemorrhage. If you have had unprotected sex or a contraceptive accident, emergency contraception should be taken as soon as possible to prevent pregnancy.
If you have any questions about this, please speak to your healthcare provider. Frequently asked questions. When did you have sex without a contraceptive or have a contraceptive accident? Select hour a. Please select a time earlier than the present. 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.
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. 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. World globe An icon of the world globe, indicating different international options. Get the Insider App. Click here to learn more. A leading-edge research firm focused on digital transformation.
Women's Health. Primary Care. Plan B levonorgestrel is an emergency contraceptive pill that works by temporarily halting ovulation. Plan B is sometimes referred to as the morning-after pill. The sooner you take Plan B, the better your chances are of avoiding pregnancy. In fact, one manufacturer of the medication recommends taking it within 12 hours, if possible. They also state that Plan B is 95 percent effective when used within 24 hours. For those reasons, Plan B is most effective when taken as quickly as possible.
Sperm can live for up to 5 days within the female reproductive tract. If you ovulate and release an egg, the egg can become fertilized at any point during that timeframe. Even if you have regular periods, you might not be able to gauge exactly when ovulation is going to occur. For that reason, taking Plan B before ovulation, and as quickly as possible after unprotected sex, is your best bet. It can be used to prevent pregnancy after contraception failure, such as having a condom break during sex.
It can also be used as emergency contraception by people who miss one or more doses of their regular birth control medication. The only active ingredient in Plan B is levonorgestrel. Levonorgestrel is a synthetic-steroid progestin hormone that mimics progesterone. When progesterone levels are high, ovulation cannot occur. This temporarily stops your ovary from releasing an egg.
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