While most men occasionally fail to get an erection, or lose one prematurely during sexual activity, some men suffer from these problems regularly. Accurate statistics are lacking on how many men are affected by the condition, but some doctors estimate that about half of men aged 40 to 70 have frequent problems achieving or maintaining an erection. The number of men with erectile dysfunction is low for those under the age of 40, but it increases with age. ED is a condition during which a penis does not get enough rigidness, or erection does not last long enough for a satisfying sexual intercourse to happen. Problems with erection that persist at least 6 months are a clear symptom of ED. What is viagra? Viagra is the brand name for Sildenafil citrate, and is used for treating erectile dysfunction and pulmonary arterial hypertension. Originally developed by scientists in Great Britain, it was brought onto the market by Pfizer Inc Viagra works by inhibiting an enzyme called cGMP-specific phosphodiesterase type 5, that delays degradation of cGMP, which controls blood flow in the penis.www.02-online.com
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