Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Vardenafil can cause a serious drop in your blood pressure when used with certain other medications. Some products that may interact with this drug include: nitrates (such as nitroglycerin, isosorbide), nitric oxide donor drugs (such as nitroprusside), recreational drugs called "poppers" containing amyl or butyl nitrite, alpha blocker medications (such as doxazosin, prazosin, terazosin), drugs to treat high blood pressure.

Other medications can affect the removal of vardenafil from your body, which may affect how vardenafil works. Examples include azole antifungals (such as ketoconazole, itraconazole), macrolide antibiotics (such as erythromycin, clarithromycin), HIV protease inhibitors (such as indinavir, ritonavir), among others.

Many drugs besides vardenafil may affect the heart rhythm (QT prolongation), including amiodarone, procainamide, quinidine, sotalol, among others.

Do not take this medication with any other product that contains vardenafil or other similar medications used to treat erectile dysfunction/pulmonary hypertension (such as sildenafil, tadalafil).

OVERDOSE: If overdose is suspected, contact a poison control center or emergency room immediately. US residents can call the US National Poison Hotline at 1-800-222-1222. Canada residents can call a provincial poison control center. Symptoms of overdose may include: back/muscle pain, abnormal vision.

NOTES: Do not share this medication with others.

MISSED DOSE: Not applicable.

STORAGE: Store at room temperature away from light and moisture. Do not store in the bathroom. Keep all medications away from children and pets.

Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company for more details about how to safely discard your product.

Information last revised April 2011. Copyright(c) 2011 First Databank, Inc.