Monday, March 3, 2008

A Comparsion Between Viagra, Cialis, And Levitra

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.

Resource: www.articledashboard.com

1 comment:

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