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Erectile dysfunction is a condition that affects millions of men worldwide, in fact it is thought that one in ten men will be affected at some point in their lifetime. Sildenafil citrate is an effective treatment for erectile dysfunction sold as the drug Viagra. Now with online pharmacies it is possible to buy sildenafil no prescription necessary. Erectile dysfunction is characterized by an inability to get an erection or maintain an erection during sexual arousal or intercourse.
Sildenafil citrate has been available to those who suffer from erectile dysfunction for over a decade. Originally the drug was only available with a doctor’s prescription, but now to purchase sildenafil citrate no prescription is necessary. The drug is now freely available over the internet and because to purchase sildenafil citrate no prescription is needed, many men who would have previously been too embarrassed or uncomfortable discussing their problem are now able to easily order sildenafil citrate.
In a man without erectile dysfunction arousal causes a series of chemical reactions at a molecular level to occur which result in the arteries and blood vessels leading to the penis dilating. The dilated arteries increase the blood flow to the corpa cavernosa, the two muscular structures that run either side of the shaft. The corpa cavernosa then become engorged with blood, enlarging and stiffening the penis into an erection.
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A man suffering from erectile dysfunction is unable to attain or keep an erection due to an inadequate blood flow to the corpa cavernosa when he is sexually aroused. The restricted blood flow is caused by the constriction of the arteries and blood vessels by the phosphodiesterase type 5 enzyme, which occurs naturally in the body. The enzyme is a vasoconstrictor which forces the cells lining blood vessels to contract thereby limiting the blood flow.
Sildenafil Citrate is a PDE5 inhibitor which latches on to the PDE5 enzyme and effectively deactivating. The blood vessels are then able to dilate increasing the blood flow to the corpa cavernosa enough to produce an erection. The drug will only be effective if the man taking it is sexually aroused, this is because the PDE5 is only present in the blood during arousal, without it the sildenafil citrate will have nothing to deactivate.
Erectile dysfunction can be a very distressing and often highly embarrassing problem for many men. The discovery of Viagra and the fact that, now, to purchase sildenafil citrate no prescription is needed means that erectile dysfunction has become a highly treatable and easily manageable condition. It is also more discreet for men to buy sildenafil citrate online.