About 20 minutes.: Viagra (sildenafil) does not begin to work immediately, it has to be absorbed from your stomach, enter the blood stream and reach the penile blood vessels. This usually takes 20 - 30 minutes.
Answered 2/20/2013
6.1k views
Viagra (sildenafil): Viagra (sildenafil) should be take on an empty stomache 1 hour prior to activity.
Answered 6/5/2018
6k views
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