Viagra works by dilating blood vessels in the penis relax and widen - which allows more blood to flow into the penis and restricted blood flow out of the penis thereby generating an erection. Don't drive, operate machinery, or do anything else that could be dangerous until you know how you react to this medicine. Viagra has several side effects of this medicine. Sexual energy and impotence, premature ejaculation, the most common prescription treatments. Alcohol abuse, and vascular disease may seriously inhibit the ability of a man to get or maintain an erection.
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