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The decision to use Viagra or not can be a daunting task, that is why in this guide, you will discover more about the potency of this sex pill. How Viagra works by the release of nitric oxide in the penis during sexual stimulation is the main cause of erection in the penis. The Guanylate Cyclase enzyme is activated by the nitric oxide which leads to an increase in the levels of cyclic guanosine monophosphate (cGMP). This causes an inflow of blood in the penis and produces a smooth relaxation of the muscles in the penis.Since phosphodiesterase type 5 (PDE5) is responsible for the degradation of cGMP in the penis, the role of sildenafil is to enhance the effect of nitric oxide by inhibiting the PDE5.There is no direct effect of sildenafil on the isolated human penis.When the local release of nitric oxide is caused by sexual stimulation, sildenafil causes an increased level of cGMP in the penis by inhibiting PDE5. Thus, the smooth muscles of the penis are relaxed and there is an inflow of blood into it.In the absence of sexual stimulation, sildenafil even at recommended doses does not have any effect.This book is the complete guide on generic viagras pills for men, Viagra pills for women, Viagra 100mg pills for men, buy cheap viagra online, how to buy generic viagra online and much more! Use this information contained herein to better your sexual health function. Treat erectile dysfunction using Viagra sex pills and last even longer in bed.