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Effects of Us source generic viagra on Sperm. There was no effect on sperm motility or morphology after single 100 mg oral doses of VIAGRA in healthy volunteers. Pharmacokinetics. VIAGRA is rapidly absorbed after oral administration, with a mean absolute bioavailability of 41 (range 2563). The pharmacokinetics of sildenafil are dose-proportional over the recommended dose range. It is eliminated predominantly by hepatic metabolism (mainly CYP3A4) and is converted to an active metabolite with properties similar to the parent, sildenafil. Both sildenafil and the metabolite viagra indonesia terminal half lives of about 4 hours. Mean sildenafil plasma concentrations measured after the administration of a single oral dose of 100 mg to healthy male volunteers is depicted below: Figure 5: Mean Sildenafil Plasma Concentrations in Healthy Male Volunteers.

A one year study of males with an average age of 54 showed an increase in testosterone of 5.

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