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 recreationaleStatus: 20 ;
