The therapeutic class of Iron Sucrose is haematinic. Iron Sucrose Injection USP is a brown, sterile, aqueous, complex of Polynuclear Iron (III) Hydroxide in Sucrose for Intravenous use. The drug product contains approximately 30% Sucrose w/v (300 mg/ml) and has a pH of 10.5-11.1. Following intravenous administration, Iron Sucrose Injection is dissociated into Iron and Sucrose by the reticuloendothelial system, and Iron is transferred from the blood to a pool of Iron in the liver and bone marrow. Ferritin, an Iron storage protein, binds and sequesters Iron in a nontoxic form, from which Iron is easily available. Iron binds to plasma transferrin, which carries Iron within the plasma and the extracellular fluid to supply the tissues. The transferrin receptor, located in the cell, and the transferrin-receptor complex is returned to the cell membrane. Transferrin without Iron (apotransferrin) is then released to the plasma. The intracellular Iron becomes (mostly) haemoglobin in circulating red blood cells (RBCs). Transferrin synthesis is increased and ferritin production reduced in Iron deficiency. The converse is true when Iron is plentiful. Its elimination halflife is 6 h, total clearance is 1.2 L/h, non-steady state apparent volume of distribution is 10.0 L and steady state apparent volume of distribution is 7.9 L. In Iron Sucrose, its Iron component appears to distribute mainly in blood and to some extent in extravascular fluid. A significant amount of the administered Iron distributes in the liver, spleen and bone marrow and that the bone marrow is an Iron trapping compartment and not a reversible volume distribution. The sucrose component is eliminated mainly through urinary excretion.