an erection that won't go away (priapism). In case you have an erection that lasts greater than four hours, get health care assistance instantly. If It is far from treated at once, priapism can permanently hurt your penis.Il tadalafil può inibire debolmente anche la fosfodiesterasi di tipo 6 (PDE6; 700 volte meno potente sulla PDE6 rispetto alla P