Also tell your doctor if you or any of your family members have or have ever had long QT syndrome a heart condition or retinitis pigmentosus an eye disease or if you have ever had severe vision loss, especially if you were told that the vision loss was caused by a blockage of blood flow to the nerves that help you see. Sudden sensorineural hearing loss associated with vardenafil. If you have certain health conditions or are taking certain medications, your doctor may tell you to take vardenafil less often. What special precautions should I follow? Do not use any of the medication from the pack if any of the blisters are torn, broken, or do not contain tablets. Ask your pharmacist if you have any questions about the type of vardenafil you were given. What should I do if I missed a dose of Levitra Vardenafil?Stroke An unusual or allergic reaction to vardenafil, other medications, foods, dyes, or preservatives Pregnant or trying to get pregnant Breast-feeding How should I use this medication? Take this medication by mouth with a glass of water. Follow the directions on the prescription label. You may take this medication with or without meals. What side effects can this medication cause? What should I know about storage and disposal of this medication? In case of emergency/overdose What other information should I know? Brand names Why is this medication prescribed? Vardenafil is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Health and wellness Drug encyclopedia Levitra 20 mg tablet Medication name Uses How to use Side effects Precautions Drug interactions Overdose Notes Missed dose Storage Important note Information last revised August .