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Approximately 140 million men all over the world are estimated to suffer from sexual dysfunction. Over half of all males with erectile dysfunction are assumed to have some physical (medical) cause. The remainder are believed to have psychological causes of impotence. Diabetes and vascular disorders, nerve damage or urological conditions are medical causes of sexual dysfunction.
Penile erection occurs when the blood flow to the penis increases and the blood vessels carrying blood away from the penis diminish the removal of blood. In healthy men, sexual arousal causes the production and release of nitric oxide in the penis. Afterwards, nitric oxide activates the enzyme - guanylate cyclase - which brings on the production of cyclic guanosine monophosphate (cGMP). It is the cGMP that regulates the amount of blood is carried to and away from the penis.
Viagra (sildenafil) is used for the treatment of ED of either physical or psychological cause. Viagra is a blue, coated, rounded, diamond-molded pill that comes in 25, 50, and 100 mg tablets. Viagra inhibits an enzyme called phosphodiesterase-5 (PDE5) that destroys the cGMP. Therefore, sildenafil precludes the destruction of cGMP and allows cGMP to increase in quantity and persist longer. The longer cGMP persists, the more protracted the engorgement of the penis.
Viagra is quickly absorbed. Maximum observed plasma concentrations are reported within 30 to 120 minutes after oral administration in the fasted state. When Viagra is taken with a high-fat meal, the rate of absorption becomes slower, with an average delay in the time to maximal concentration of 1 hour.
Sildenafil increases the effects of heart medicines and nitrates that are prescribed chiefly for treating angina. Therefore, drug interactions with heart medications and nitrates can be dangerous.
About 15% of people taking Viagra have side effects. The commonest side effects are facial flushing (1 in 10), headaches (1 in 6), stomachache, sickness, diarrhoea, and an inability to differentiate between the colors green and blue.
Please consult your doctor before taking sildenafil. If your doctor has prescribed you sildenafil, stringently follow the recommended dose.
Article Source: http://www.everyonesarticles.com
VIAGRA is an efficient medication used to treat erectile dysfunction. These days you can order viagra on-line.
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