In vitro experiments have revealed that sildenafil is selective for phosphodiesterase-five (PDE5) . Its effect is much more powerful on PDE5 than on other acknowledged phosphodiesterases . In particular, There's a ten-moments selectivity more than PDE6 which can be linked to the phototransduction pathway in the retina . It is https://erict074jig1.wikijournalist.com/user