How Long Does Sildenafil (Viagra) Work ?

Mean Sildenafil Plasma Concentrations in Healthy Men

The above graph depicts how sildenafil plasma concentrations rose and decline over a period of time. The levels measured are from the semen which contains one-thousandth part of the effective plasma concentration in the body. Max sildenafil plasma levels occur for most men between 30 min to 2 hours and is the window of maximum effect.

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