How Does Viagra Work?

Does Viagra Work Without Stimulation?

Many men wonder if Viagra works without any stimulation. The answer to this question is no. This is because the chemicals that cause an erection need to be released into the penis. These chemicals are released only when a person is aroused. Viagra has no effect on the release of these chemicals. It only keeps the chemicals in the penis longer.
 

How Quickly Does Viagra Work?

Many men wonder, "How long do I have to wait for Viagra to work?" The answer will vary, depending on the individual. In clinical studies, Viagra began to work in as little as 14 minutes. For most men, though, it begins working within 30 minutes. The medication can continue to work for at least four hours; but, on average, the response decreases after about two hours.
 
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Written by/reviewed by: Kristi Monson, PharmD; Arthur Schoenstadt, MD
Last reviewed by: Kristi Monson, PharmD;
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