비아그라에 대해 알려지지 않은 사실
At single oral doses of a hundred mg and 200 mg, transient dose-similar impairment of shade discrimination was detected using the Farnsworth-Munsell a hundred-hue examination, with peak results near the time of peak plasma degrees. This obtaining is in keeping with the inhibition of PDE6, which can be involved in phototransduction during the retina