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an erection that will not go away (priapism). When you've got an erection that lasts greater than 4 hours, get professional medical aid at once. If It's not dealt with without delay, priapism can completely problems your penis.Il tadalafil può inibire debolmente anche la fosfodiesterasi di tipo six (PDE6; 700 volte meno potente sulla PDE6 rispetto