Viagra, Cialis and Levitra

Posted on December 19th, 2007 by olga

A Comparison between Viagra, Cialis and Levitra
Viagra is the business brand name for Sildenafil Citrate, which is used for treating erectile dysfunction in men. It was first created to treat angina, or heart disease, by the Pfizer pharmaceutical company. Nevertheless, after clinical studies, it was noticed that drug in fact boosted erections in men. The drug was given exclusive rights in 1996, and later approved by the FDA (Food and Drug Administration) on March 27th, 1998. This was really the first erectile dysfunction drug in pill form, to be approved by the FDA.
Viagra releases nitric oxide in the corpus cavernosum. This makes active the enzyme guanylate cyclase, which results in greater levels of cyclic guanosine monophosphate. This consecutively results in muscle relaxation in the corpus cavernosum, which boosts the flow of blood into the penis. This drug only works, nevertheless, if there is sexual stimulation and a boost in levels of guanosine monophosphate. It works in about thirty minutes and lasts for up to four hours.
Cialis was first brought in February of 2003. Cialis is the commercial brand given name for Tadalafil. This drug was developed to as well treat impotence, or erectile dysfunction. It was granted by the FDA on November 21st, 2003. This drug has a form of a pill, and is taken orally.
Just similar to Viagra, Cialis increases the effects of chemicals in the body that are normally released into the penis for the period of sexual arousal. That consecutively, boosts blood flow to the penis, which results in a longer and harder erection for the period of sexual stimulation. It starts working in thirty minutes and lasts for up to thirty six hours.
In conclusion, let’s pay our attention to Levitra. Levitra is actually the commercial brand name for Vardenafil HCI. It was first established in 2003, and was approved by the FDA in September 2003.
Similar to Viagra and Cialis, Levitra increases the effects of chemicals in the body that are as a rule released into the penis for the duration of sexual arousal. The huge dissimilarity between these drugs is that one can take a considerably smaller dosage of Levitra and Cialis. The highest 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.
Viagra starts working in thirty minutes and lasts up to four hours. Cialis starts working in thirty minutes and lasts up to thirty-six hours. Levitra starts working in twenty-five minutes and lasts up to twenty four hours. As a result no matter which drug you prefer, they all work in about the identical way, the only dissimilarity is the dosage, the time it takes for the drug to work, and the amount of time that the drug’s effects last.