an erection that won't disappear (priapism). When you have an erection that lasts in excess of 4 several hours, get health care support instantly. If It isn't taken care of right away, priapism can forever hurt your penis.Il tadalafil può inibire debolmente anche la fosfodiesterasi di tipo 6 (PDE6; 700 volte meno potente sulla PDE6 rispetto alla P