When sexual stimulation brings about area release of NO, inhibition of PDE5 by sildenafil causes increased levels of cGMP in the corpus cavernosum, resulting in clean muscle peace and inflow of blood on the corpus cavernosum. Sildenafil at proposed doses has no impact while in the absence of sexual stimulation. https://angeloumgtf.blogaritma.com/30362425/viagra-tablets-online-pharmacy-fundamentals-explained