an erection that will not go away (priapism). Should you have an erection that lasts more than 4 hrs, get health care help immediately. If It's not at all dealt with straight away, priapism can permanently harm your penis.Il tadalafil può inibire debolmente anche la fosfodiesterasi di tipo six (PDE6; 700 volte meno potente sulla PDE6 rispetto alla