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Do not take Viagra while also taking Revatio, unless your doctor tells you to. Important information. Some medicines can cause unwanted or dangerous effects when used with Viagra.

Frequency not reported: Non-arteritic anterior ischemic optic neuropathy (NAION), retinal vascular occlusion, visual field defect, cataract [Ref] This drug has lesser affinity for isoenzyme PDE6, an enzyme found in the retina. This lower selectivity is thought to be the basis for abnormalities related to color vision observed with higher doses or plasma levels. -Visual color distortions: Chloropsia, chromatopsia, cyanopsia, erythropsia and xanthopsia.

Viaagra, TX R. Systemic drugs won adrenergic properties (e.]