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are allergic to sildenafil, as contained in VIAGRA and Revatio®, or any of the elements in VIAGRAConsequently, the metabolite is liable for about 20% of sildenafil's action. Sildenafil is excreted as metabolites predominantly in the feces (about eighty% of administered oral dose) also to a lesser extent from the urine (all-around 13% of the admini