82% of patients
who take VIAGRA experience an improvement in their erections.
That means more than 4 out of every 5 couples who try VIAGRA benefit
from it. VIAGRA improves erections in most men regardless of how
long they have had ED, what caused it, or how old they are. And
the effectiveness of VIAGRA has been proven in clinical studies
of thousands of patients.
many men with ED to respond to sexual stimulation. 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 and harden, 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.
Viagra, also known
as Sildenafil, does not directly give a man an erection. It works
by boosting the natural mechanism that leads to an erection. When
a man is sexually aroused, certain tissues in his penis relax.
This allows large amounts of blood to flow into the muscle, thus
producing an erection. Viagra helps by elevating the levels of
the chemical that causes the tissues to relax. These effects were
discovered accidentally. The drug was originally developed to
improve blood supply to the heart in angina sufferers.