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Use
Viagra treats erectile dysfunction, the inability to achieve
and/or maintain an erection of the penis that is adequate
for sexual intercourse. Ten to fifteen million men in the
United States suffer from ED, and by age 65, up to 25% of
men have experienced impotence problems. Erectile dysfunction
can be caused by a number of physical and psychological conditions,
including diabetes, depression, prostate cancer, spinal cord
injury, multiple sclerosis, artherosclerosis, and heart disease.
Injuries to the penis that cause nerve, tissue, or vascular
damage can trigger impotence. It is also a common side effect
of some prescription medications, including antihistamines,
antidepressants, antihypertensives, antipsychotics, beta blockers,
diuretics, tranquilizers, appetite suppressants, cimetidine
(Tagamet), and finasteride (Propecia).
Precautions
Viagra is not labeled or approved for use by women or children,
or by men without erectile dysfunction. The medication may
also be contraindicated (not recommended for use) in patients
with certain medical conditions. Anyone experiencing cardiovascular
symptoms such as dizziness, chest or arm pain, and nausea
when participating in sexual activity after taking Viagra
should stop the encounter. They should also not take Viagra
again until they have discussed the episode with their healthcare
provider. It is recommended that men with kidney or liver
impairments, and men over age 65, start at the lowest possible
dosage of Viagra (25 mg). Clinical studies have shown that
the drug builds up in the plasma of these patients to a concentration
that is three to eight times higher than normal. Caution is
also recommended in prescribing the drug to individuals with
retinitis pigmentosa, a rare genetic eye disorder. Viagra
should not be taken more than once per day by anyone.
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