In vitro experiments have proven that sildenafil is selective for phosphodiesterase-five (PDE5) . Its outcome is much more potent on PDE5 than on other known phosphodiesterases . Especially, There exists a ten-periods selectivity around PDE6 which is involved with the phototransduction pathway in the retina . Substances: Royal Power Honey https://khalilz106omk2.blogozz.com/profile