Levonorgestrel (Plan B) is a progestin.

Use Levonorgestrel (Plan B) as directed by your doctor.

Take Levonorgestrel (Plan B) as soon as possible after suspected birth control failure or after you have unprotected sexual intercourse. The first dose must be taken within 72 hours. Take the second tablet 12 hours after the first tablet.

Check with your doctor if any of these most COMMON side effects persist or become bothersome:

Breast tenderness; changes in menstrual flow; diarrhea; dizziness; headache; nausea; stomach pain; tiredness; vomiting.

Seek medical attention right away if any of these SEVERE side effects occur:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); lower stomach pain; missed menstrual period; spotting instead of your usual period.

This is not a complete list of all side effects that may occur. If you have questions or need medical advice about side effects, contact your doctor or health care provider.

Tell your health care provider if you are taking any other medicines, especially any of the following:

Antifungals (eg, ketoconazole), barbiturates (eg, phenobarbital), bosentan, carbamazepine, felbamate, griseofulvin, HIV protease inhibitors (eg, indinavir), hydantoins (eg, phenytoin), modafinil, nevirapine, penicillins (eg, amoxicillin), rifampin, St. John's wort, tetracyclines (eg, doxycycline), topiramate, or troglitazone because they may decrease Plan B 's effectiveness
Anticoagulants (eg, warfarin) because their actions and the risk of their side effects may be increased or decreased by Levonorgestrel (Plan B)
Beta-adrenergic blockers (eg, metoprolol), corticosteroids (eg, prednisone), selegiline, theophylline, or troleandomycin because their actions and the risk of their side effects may be increased by Levonorgestrel (Plan B)
Lamotrigine because its effectiveness is decreased, and, when Levonorgestrel (Plan B) is stopped, toxic effects, such as nausea, dizziness, and vision problems, may occur

This may not be a complete list of all interactions that may occur. Ask your health care provider if Levonorgestrel (Plan B) may interact with other medicines that you take.

If overdose is suspected, contact your local poison control center or emergency room immediately.

Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

if you are planning to become pregnant or are breast-feeding

if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement

if you have allergies to medicines, foods, or other substances

if you have a history of ectopic pregnancy or you are premenstrual

if you have diabetes

If you miss a dose of Plan B , contact your doctor right away.

Preventing pregnancy after unprotected sexual intercourse or suspected birth control failure.

Store at room temperature between 15 and 30 degrees C / 59 and 86 degrees F.

Levonorgestrel (Plan B) is an emergency contraceptive. It should not be used for routine birth control.

Levonorgestrel (Plan B) does not protect against HIV infection and other sexually transmitted diseases.

Diabetes patients - Levonorgestrel (Plan B) may affect your blood sugar. Check blood sugar levels closely. Ask your doctor before you change the dose of your diabetes medicine.

If you have any questions about Levonorgestrel (Plan B), please talk with your doctor, pharmacist, or other health care provider.