LITTLE KNOWN FACTS ABOUT VIAGRA.

This metabolite contains a PDE selectivity profile just like sildenafil and an in vitro potency for PDE5 approximately 50% with the parent drug. Plasma concentrations of this metabolite are somewhere around 40% of People found for sildenafil, so that the metabolite accounts for around 20% of sildenafil's pharmacologic results.This doc doesn't incor