It is hard to turn on the television today without hearing
about Viagra, Cialis, or Levitra. There are literally
thousands of websites on the internet that sell these
products. Most individuals don't really know exactly what
these drugs accomplish. They sound like ancient Greek
mythological characters. So what exactly are these drugs
and what exactly do they specifically do for men? Let's
explore each one individually.
First, let's take a closer look at Viagra. Viagra is the
commercial brand name for Sildenafil Citrate, which is for
treating erectile dysfunction in adult males. It was first
developed to treat angina, or heart disease, by the Pfizer
pharmaceutical company. However, after clinical studies,
it was noticed that drug actually enhanced erections in
men. The drug was patented in 1996, and subsequently
approved by the FDA (Food and Drug Administration) on March
27th, 1998. This was actually the first erectile
dysfunction drug in pill form, to be approved by the FDA.
It is only available by prescription from a doctor.
Viagra works by releasing nitric oxide in the corpus
cavernosum. This activates the enzyme guanylate cyclase,
which results in greater levels of cyclic guanosine
monophosphate. This in turn results in muscle relaxation
in the corpus cavernosum, which increases the flow of blood
into the penis. This drug only works, however, if there is
sexual stimulation and an increase in levels of guanosine
monophosphate. It works in about thirty minutes and lasts
for up to four hours.
Cialis was first introduced in February of 2003. Cialis is
the commercial brand name for Tadalafil. This drug was
developed to also treat impotence, or erectile dysfunction.
It was approved by the FDA on November 21st, 2003. It is
marketed by Lilly ICOS, which is a joint venture between
Eli Lilly and Company and ICOS Corporation. This drug
comes in a pill form, and is taken orally. It is only
available by prescription from a doctor.
Just like Viagra, Cialis works by increasing the effects of
chemicals in the body that are normally released into the
penis during sexual arousal. That in turn, increases blood
flow to the penis, which results in an longer and harder
erection during sexual stimulation. It works in about
thirty minutes and lasts for up to thirty six hours.
Finally, let's take a closer look at Levitra. Levitra is
really the commercial brand name for Vardenafil HCI. It is
marketed by the Bayer Pharmaceuticals Corporation. It was
first introduced in 2003, and was approved by the FDA in
September 2003. It is only available by prescription from
a doctor.
Like Viagra and Cialis, Levitra works by increasing the
effects of chemicals in the body that are normally released
into the penis during sexual arousal. The big difference
between these drugs is that one can take a substantially
smaller dosage of Levitra and Cialis. The maximum dosage
for Viagra is 100mg, while it is 20mg for Cialis, and
Levitra. Levitra works in about twenty-five minutes and
lasts for up to twenty four hours.
So there you have it. Viagra works in thirty minutes and
lasts up to four hours. Cialis works in thirty minutes and
lasts up to thirty-six hours. Levitra works in twenty-five
minutes and lasts up to twenty four hours. So no matter
which drug you choose, they all work in about the same way,
the only difference is the dosage, the time it takes for
the drug to work, and the amount of time that the drug's
effects last.
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Bryan Pringle, Ph.D., is an author and an webmaster of
websites offering news and information about erectile
dysfunction and pharmaceutical drugs. For more
information, please visit:
http://www.consumersdiscountrx.com/discount_prescription_rx
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