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Viagra and Cialis

Viagra, the now well known erectile dysfunction drug, was approved by the Food and Drug Administration in March 1998. Since then the drug has been marketed to a huge success in all countries usually whether it was approved by the local health authority or not.

Viagra was initially being researched as a Heart Agent to help men deal with chest pain. It was discovered that Viagra was effective in a process that relaxed soft muscles that controlled the flow of blood to the penis, with that relaxation blood flows easily to create more effective erections. The number of side effects found during testing was so low that the FDA approved the drug within the same year Pfizer applied for it to be available as a common prescription medication.

Erectile dysfunction in men can be caused by various factors such as spinal injury or prostate surgery among others. Prior to the introduction of Viagra invasive techniques were needed to correct this condition such as implants or injections. The chemical in the stylish designed blue pill is called Sidenafil Citrate. It is a group of drugs which soon received more attention by other drug companies like Eli Lilly and Bayer after the great financial success Viagra enjoyed.

After the pill is taken with food it takes about half an hour after which the drug is effective. The ability to easily sustain erections on average lasts about 3 - 4 hours which is called the half life of the drug. These properties are targeted by Eli Lilly and Bayer with the advent of their own new sexual health drugs Cialis and Levitra. Cialis is effective half an hour after taken compared to Viagra's 1 hour and can last up to 36 hours compared to Viagra's 4 hours. The marketing for these new drugs alleged that 4 hours put too much pressure on the drug users to perform and that they would be more comfortable with a 36 hour drug.

There have also been a number of interesting developments related to these drugs. Primarily they have been available on the black market as recreational drugs, very probably due to the large media coverage they received shortly after they were released. Of particular note is that Viagra should not be taken by women or children.

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