Iron sucrose is generally used to treat iron deficiency anemia. It is a complex with an average molecular weight of 43 kDa formed by a multinuclear iron hydroxide core surrounded by a large number of non-covalently bound sucrose molecules. This macromolecular structure avoids elimination from the kidneys and is almost entirely utilized and is not harmful to the kidneys. This complex is structurally stable and does not release iron ions under physiological conditions. The structure of the iron surrounded by the multinuclear core is similar to the structure of ferritin in the physiological state. It is used for the treatment of iron deficiency anemia that is not effectively relieved by oral iron and for the treatment of iron deficiency anemia in patients on long-term hemodialysis who are being supplemented with erythropoietin. Iron Sucrose, a polynuclear iron hydroxide, is contraindicated in patients who are allergic to the excipients in Iron Sucrose Injection. The drug needs to be applied under medical supervision.