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Viagra is the trade name of the drug containing sildenafil citrate used for curing impotency among men and manufactured and patented by Pfizer. It has become extremely popular and so has Generic Viagra, which contains the same ingredients. Thus, the original and Generic Viagra are similar in their contents. Though similar ingredients make up the generic and branded Viagra, there is a huge difference in prices. The original and Generic Viagra differ in that original Viagra has the power of research behind it. Original Viagra has also to make up for its patents. Hence, it is quite expensive compared to generic sildenafil citrate. On the other hand, there are some advantages to buying original Viagra. The main one is that it is safe.Next
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However, when a man is aroused these arteries open up and allow blood to flow into the penis, resulting in an erection. These arteries do not open properly when a man has erectile dysfunction. How Blood Flows to the Penis
Your brain needs to be able to turn on and off the valve of blood flow to the penis. The control of blood flow is a four-step process. The first step is that the brain sends a signal down a nerve fiber, which ends in an NANC nerve cell in an artery. NANC, nonadrenergic-noncholinergic nerve cell, is able to create nitric oxide. Next, the NANC injects nitric oxide into the blood. Then the nitric oxide stimulates guanylate cyclase in nearby cells, and this enzyme starts producing a chemical called cyclic guanosine monophosphate (cGMP).
The US Food and Drug Administration is investigating whether Viagra is responsible for more than 40 cases reported of a condition that causes blindness. Nonarteritic anterior ischemic optic neuropathy occurs when blood flow is cut off from the optic nerve. Related Results Is Viagra my saviour? Viagra Cheap rival rises to challenge ViagraChinese burn Viagra replicas for randy ancestorsWives `should be consulted before Viagra is prescribed' COPYRIGHT 2005 Society of Chemical Industry COPYRIGHT 2008 Gale, Cengage Learning.