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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 heart problems (e.g., cardiomyopathy), congestive heart failure, irregular heartbeat, blood pressure problems, cancer of the blood (e.g., leukemia, myeloma), bleeding disorders, kidney or liver problems, eye problems, or if you have ever had severe vision loss.                      

If you have a deformed penis or conditions that may cause a prolonged erection (e.g., sickle cell anemia).  Some medicines may interact with Levitra. Tell your health care provider if you are taking any other medicines, especially any of the following:
Alpha-blockers (e.g., prazosin), delavirdine, HIV protease inhibitors (e.g., ritonavir), imidazoles (e.g., itraconazole), ketolides (e.g., telithromycin), macrolides (e.g., erythromycin), or quinolones (e.g., moxifloxacin) because the risk of side effects, such as low blood pressure, a prolonged erection, or irregular heartbeat, may be increased.

Certain antiarrhythmics (e.g., amiodarone, quinidine), nitrates (e.g., isosorbide), or nitroglycerin because the risk of side effects, such as irregular heartbeat and severe low blood pressure, may be increased.

This may not be a complete list of all interactions that may occur. Ask your health care provider if Levitra may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.

Use Levitra as directed by your doctor. Check the label on the medicine for exact dosing instructions.
Levitra may be taken with or without food.
Take Levitra by mouth about 1 hour before sexual activity.
Do not take Levitra more often than once daily as needed. If you miss a dose of Levitra, take it as soon as you remember. Continue to take it as directed by your doctor.