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Viagra FAQs
Before you order Viagra online, you should inform yourself of the potential advantages and disadvantages of this drug. Here are answers to some of the Viagra world's most frequently asked questions.What is Viagra?
Viagra is a drug developed by Pfizer for the treatment of male
impotency. Its pharmacological name is sildenafil citrate.
It was approved by the US Food & Drug Administration in
March 1998 for the treatment of male impotency.
What does Viagra do?
Viagra increases the body's ability to achieve and maintain
an erection during sexual stimulation. Viagra does not produce
spontaneous erections; sexual stimulus must be present for erection
to occur.
How does Viagra work?
Viagra is dispensed as a pill and ingested orally. After absorption
into the bloodstream, it functions as an inhibitor to an enzyme
called phosphodiesterase 5 (PDE5) which is found primarily in
the penis. The enzyme, PDE5 breaks down cyclic GMP. Cyclic GMP
is produced during sexual stimulation, leading to penis erection.
The longer the cyclic GMP is allowed to persist, the greater
the chance for increased blood flow to the penis, thereby generating
an erection.
How long does Viagra remain effective
after ingestion?
The half-life is approximately 4 hours. If is recommended that
sexual stimulation commence from 30 to 60 minutes after Viagra
is taken.
What happens if there is no sexual stimulation
after Viagra is taken?
Sildenafil, or Viagra, is excreted as metabolites from the body
in feces and urine.
What is Viagra's success rate?
Viagra's success rate is about 75%.
Are there any side effects?
Yes, a small percentage of the study group experienced headaches,
nausea, facial flushing, diarrhea, urinary tract infection and
visual changes to color sensitivity.
Who should NOT take Viagra?
The main contraindication to prescribing Viagra are people
who suffer from a rare disease, retinitis pigmentosa, or those
who are on nitroglycerin or nitrous oxide.
Recently, it has been reported that 16 Viagra patients have
died. While there is no direct evidence that Viagra caused the
deaths, readers should be aware that sexual activity increases
cardiac risk. Male impotence is often a side effect of more
serious cardiovascular problems.
Viagra MUST NOT be taken by men who are on medications containing
nitrates, such as nitroglycerine tablets, as this could lead
to dangerous lowering of blood pressure. There is evidence to
suggest that Viagra may interact with other medications in such
a way as to increase health risk. Men who have medical conditions,
such as sickle cell anemia, leukemia, or multiple myeloma, or
those with abnormally-shaped penis should also not take Viagra
because of a possibility of producing a sustained erection.
Can I get Viagra over-the-counter?
No, Viagra should be taken only by prescription from a qualified
physician. You must tell your doctor exactly what other medications
you are taking. FDA regulations do not permit Viagra to be
purchased without a physician's prescription.
How often should Viagra be taken?
For those patients who have been prescribed Viagra by their
doctors, Viagra should only be taken once per day, about 1
hour before sexual activity.
What Viagra dosage is best?
Many physicians are now recommending Viagra therapy begin with
25mg dosage, the minimum. Standard dose is 50mg. Dosages higher
than 100mg per day are NOT recommended.
Can Viagra be combined with other treatments
for erectile dysfunction?
The use of such combinations is NOT recommended, since no studies
have been done to assess its safety and effectiveness.
Are there concerns about taking Viagra
for long periods?
Yes. Some health practitioners are concerned since little is
known about Viagra's long term effects.
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