In this Article

• What is levonorgestrel emergency contraceptive (Plan B One-Step)?
• What are the possible side effects of levonorgestrel emergency contraceptive (Plan B One-Step)?
• What is the most important information I should know about levonorgestrel emergency contraceptive (Plan B One-Step)?
• What should I discuss with my healthcare provider before taking levonorgestrel emergency contraceptive (Plan B One-Step)?
• How should I take levonorgestrel emergency contraceptive (Plan B One-Step)?
• What happens if I miss a dose (Plan B One-Step)?
• What happens if I overdose (Plan B One-Step)?
• What should I avoid while taking levonorgestrel emergency contraceptive (Plan B One-Step)?
• What other drugs will affect levonorgestrel emergency contraceptive (Plan B One-Step)?
• Where can I get more information?

What should I discuss with my healthcare provider before taking levonorgestrel emergency contraceptive (Plan B One-Step)?

Levonorgestrel emergency contraceptive is not intended for use as a routine form of birth control and should not be used in this manner. Talk with your doctor about the many forms of birth control available.

Do not use this medication if you are already pregnant. Levonorgestrel emergency contraceptive will not terminate a pregnancy that has already begun (the fertilized egg has attached to the uterus).

Before using this medication, tell your doctor if you are allergic to any drugs, or if you have diabetes. You may not be able to use levonorgestrel emergency contraceptive, or you may need special tests during treatment.

Levonorgestrel can pass into breast milk and may harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

Do not give this medication to anyone younger than 17 years old. Contact a doctor for medical advice.

How should I take levonorgestrel emergency contraceptive (Plan B One-Step)?

Use this medication exactly as directed on the label, or as it has been prescribed by your doctor. Do not use the medication in larger amounts or for longer than recommended.

The first dose of levonorgestrel emergency contraceptive must be taken as soon as possible after unprotected sex (no later than 72 hours afterward). The second dose must be taken 12 hours after the first dose. The timing of these doses is very important for this medication to be effective.

Call your doctor right away if you vomit within 1 hour after taking either dose of levonorgestrel emergency contraceptive. Do not take another dose until you talk with your doctor.

You should be examined by your doctor within 3 weeks after taking levonorgestrel emergency contraceptive. The doctor will need to confirm that you are not pregnant and that this medication has not caused any harmful effects.

If your period is late by 1 week or longer after the expected date, you may be pregnant. Get a pregnancy test and contact your doctor if you are pregnant. Levonorgestrel emergency contraceptive will not terminate a pregnancy that has already begun (the fertilized egg has attached to the uterus).

Store levonorgestrel emergency contraceptive at room temperature away from moisture and heat.