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Erectile dysfunction is an issue that has been troubling men since we stood up erect and became our own species. It is a simple fact that this medical condition is nothing new. It has just become more prominent in the 20th century when it finally became an accepted thing to talk about sexual problems. Also, it has to be noted that the number of men suffering from ED has increased in the second half of the 20th century due to certain lifestyle changes. Namely, with the increased number of men suffering from type 2 diabetes, high blood pressure, high cholesterol and similar conditions, the number of men with ED rose as well. These are interconnected and there is no doubt that those conditions have become more prevalent as our lifestyle became more sedentary, as we started to eat junk food more and more and as we are under constant stress.
I understand people who come online looking for an answer to this question. I also understand that there is a need to tell the truth about Viagra and all those herbal supplements that are being marketed as the best solution for ED of all times. It is important to get objective info on this subject and I would like to believe that the stuff you are going to read in this article is as objective as possible.
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The nitric oxide stimulates and enzyme in nearby cells that start producing a chemical that relaxes the valve regulating blood flow into penis and makes the valve that regulates blood outflow tighter, chis chemical cGMP is most important one for the process of getting an erection. cGMP has relatively short life time, because after it has been released into the system, another set of commands from the brain activate another cells producing an enzime phosphodiesterase (PDE) which neutralizes effects of cGMP.
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The lasting period of levitra depends upon the way it is used and following the instructions given by your doctor. Always avoid taking this medicine based upon your own judgment. In this case the results can vary from simply no effects to longer duration for the effects to show to even some types of side effects.
In 2005, the FDA requested that Pfizer add a warning to Viagra that the drug may possibly lead to sudden blindness. Before you become worried that taking Viagra may make you blind, it is important that you understand why this may occur and what the risk factors are.
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