How Viagra works
Viagra has become one of the most popular drugs in the USA.
It is used to treat erectile dysfunction: the inability of some
men to get or maintain an erect penis. The European Medicines
Evaluation Agency will have to give its consent before the drug
can go on sale in Britain, but Pfizer Inc - the company that
manufactures the drug - hope to get this approval by the autumn.
How does Viagra work?
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.
Who can it help?
The drug can help impotence associated with diabetes, spinal
cord injuries, prostate surgery, and even impotence with mysterious
causes. Viagra was tested on 3,000 men with varying degrees of
impotence. It achieved a success rate of 60-80%, depending on
the dosage.
Does it have side-effects?
In a small number of cases, people who have taken Viagra have
complained of headaches, flushing and stomach-ache. It can also
cause some visual problems, including an increased sensitivity
to light, blurred vision or an inability to tell the difference
between blue and green. Men who are already taking medicines
that contain nitrates, such as nitro-glycerine, are strongly
advised not to use Viagra because the combination can lower blood
pressure too much. There are also concerns about its safety following
the deaths of a small number of American men who have taken the
drug. The Food and Drug Administration is investigating.
What other treatments are available for impotence?
Many men use vacuum devices or compression rings to get and
keep an erection. It is possible to have an injection in the
base of the penis to increase the flow of blood. Surgery and
implants are also an option in some cases. There are also several
other prescriptions and over-the-counter pills that have been
recommended for impotence problems in men, but none of these
have ever been proven to be as effective as Viagra.
This page contains basic information. If you are concerned about
your health, you should consult a doctor.
Source: BBC
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