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Viagra is approved for the treatment of men who have
difficulty having and maintaining an erection, otherwise
known as impotence.
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Cialis is a pill
used to treat erectile dysfunction (impotence) in men. It
can help many men who have erectile dysfunction get and keep
an erection when they become sexually excited (stimulated).
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When a man is
sexually aroused, certain tissues in his penis relax. This
allows large amounts of blood to flow in, thus producing an
erection.
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