The principle of action of Fildena 150 mg is similar to the principle of action of all other tablets of the category of PDE-5 Inhibitors. When the secretion of the hormone PDE-5 stops, the pill begins to act on an erection. It occurs when nitric oxide causes vasodilation of the penile arteries. The increased vasodilator effects increase penile sensitivity by increasing the amount of blood in the penile tissue.
