Levitra is a phosphodiesterase inhibitor. It works by helping to increase blood flow into the penis during sexual stimulation. This helps you to achieve and maintain an erection.
Do NOT use Levitra if:
    * you are allergic to any ingredient in Levitra
    * you have been advised by your doctor to avoid sexual activity because of heart problems
    * you have certain heart problems (eg, unstable angina, severe heart failure), low blood pressure, or uncontrolled high blood pressure
    * you have certain hereditary degenerative eye problems (eg, retinitis pigmentosa)
    * you have severe liver problems or severe kidney problems that require dialysis
    * you have had a heart attack, stroke, or life-threatening irregular heartbeat within the past 6 months
    * you are taking nitrates (eg, isosorbide, nitroglycerin) in any form (eg, tablet, capsule, patch, ointment), nitroprusside, or certain antiarrhythmics (eg, quinidine, amiodarone)
    * you use certain recreational drugs called “poppers” (eg, amyl nitrate, butyl nitrate)
Contact your doctor or health care provider right away if any of these apply...

