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When a man is sexually aroused, the arteries in the penis relax and
widen, allowing more blood to flow into the penis. As the arteries
in the penis expand, the veins that normally carry blood away from
the penis become compressed, restricting the blood flow out of the
penis. With more blood flowing in and less flowing out, the penis
enlarges, resulting in an erection. If the nerves or blood vessels
associated with this process aren't working properly, a man may not
be able to get an erection. Sildenafil Citrate increases blood flow
to the penis, so that when a man is sexually aroused, he can get and
keep an erection.
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