To provide a method of treating a subject having chronic kidney disease.SOLUTION: The method comprises administering to the subject an effective amount of a high dissolution rate ferric organic compound having a dissolution rate of at least about 2 mg/cm/min.SELECTED DRAWING: Figure 1【課題】慢性腎疾患を有する被験体を治療する方法の提供。【解決手段】高い溶解速度を有する、少なくとも約2mg/cm2/分の溶解速度を有する有効量の有機第二鉄化合物を該被験体に投与するステップを含む方法。【選択図】図1