TOP GUIDELINES OF VIAGRA

Sildenafil is a powerful and selective inhibitor of cGMP-specific phosphodiesterase sort 5 (PDE5), that's liable for degradation of cGMP inside the corpus cavernosum. The molecular structure of sildenafil is comparable to that of cGMP and functions as a aggressive binding agent of PDE5 within the corpus cavernosum, leading to much more cGMP and amp