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Vision Problems. You should also stop these medications and call your doctor right away if you have vision loss.

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Cialis and Levitra (vardenafil) don't tend to cause this. Read more. Here are some. Viagra, Levitra, (vardenafil) and Cialis all belong to PDE-5 inhibitors with same mechanism to enhancing erection of sponge bodies of penis or clitoris although coming with different onset of erection and profiles of side effects.

Has pioneered the use of electrocautery-free preservation of the neurovascular bundles (potency nerves) which are essential for the return of potency after prostate surgery. A recent study by Dr. Patrick Walsh and associates at John Hopkins has shown that mono and bipolar cautery near the potency nerves severely impact the erectile function of dogs. Mono and bipolar cautery are routinely used by many institutions to limit the bleeding during surgery by heat-sealing or 'cauterizing' the bleeding vessels. The nerves for potency are intertwined with a bundle of blood vessels, which must be controlled during prostate cancer surgery to prevent large blood losses. Thus to preserve the nerves of potency, a surgeon also must prevent the bleeding of these vessels also.

You are allergic to any ingredient in Viagra you have been advised by your doctor to avoid sexual activity because of heart problems you are taking nitrates (eg, isosorbide, nitroglycerin) in any form (eg, tablet, capsule, patch, ointment), or nitroprusside you use certain recreational drugs called "poppers" (eg, amyl nitrate or nitrite, butyl nitrate or nitrite) you take another PDE5 inhibitor (eg, tadalafil, vardenafil) or another medicine that contains sildenafil. Contact your doctor or health care provider right away if any of these apply to you. Some medical conditions may interact with Viagra. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you: 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 deformed penis (eg, cavernosal fibrosis, Peyronie disease), blood cell problems (eg, leukemia, multiple myeloma, sickle cell anemia), or any other condition that may increase the risk of a prolonged erection (priapism) if you have a history of a prolonged (more than 4 hours) or painful erection (priapism) if you have a history of certain eye problems (eg, macular degeneration, optic neuropathy, retinitis pigmentosa, sudden vision loss in one or both eyes) or hearing problems (eg, ringing in the ears, decreased hearing, hearing loss) if you have a history of liver or kidney problems, lung problems (eg, pulmonary veno-occlusive disease), high or low blood pressure, ulcers, bleeding problems, heart problems (eg, angina, aortic stenosis, heart failure, irregular heartbeat), or blood vessel problems if you have a history of heart attack, stroke, or life-threatening irregular heartbeat, especially within the past 6 months.]