Sildenafil is a powerful and selective inhibitor of cGMP-specific phosphodiesterase style 5 (PDE5), that is responsible for degradation of cGMP from the corpus cavernosum. The molecular structure of sildenafil is similar to that of cGMP and acts as a aggressive binding agent of PDE5 inside the corpus cavernosum, leading to much more cGMP and enhanc… Read More