<;P>;PROBLEM TO BE SOLVED: To provide a transfusion preparation showing a vasodilation effect and cytoprotective effect. <;P>;SOLUTION: This transfusion preparation is characterized by including a hem bonded with carbon monoxide or nitrogen monoxide at its ligand-bonding part, extendedly releasing the carbon monoxide or nitrogen monoxide after its administration in the blood vessel of a living body so as to exhibit the vasodilation effect or cytoprotective effects. <;P>;COPYRIGHT: (C)2008,JPO&INPIT