How long does it take for Viagra to be effective and for how long will the effect last?
Viagra is very rapidly absorbed. Maximum observed plasma concentrations are reached within 30 to 120 minutes (median 60 minutes) of oral dosing on an empty stomach. The study of the time course of effect showed that it lasted for up to 4 hours but the response was diminished compared to 2 hours. However there were cases when the effect lasted for 6 hours.
When Viagra is taken with a high fat meal, the rate of effectiveness is reduced.
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