Cosmofer is an intravenous iron therapy used to treat iron deficiency conditions, particularly when oral iron supplements are ineffective, not tolerated, or inappropriate. It is a form of iron dextran that replenishes the body's iron stores, helping to increase the production of red blood cells. This medication is commonly prescribed for patients with iron deficiency anemia, chronic kidney disease, or those who have had significant blood loss and require rapid improvement of their iron levels. Cosmofer is administered under the supervision of a healthcare professional, usually in a hospital or clinic setting, due to the potential for allergic reactions and the need for careful dosing based on the patient's current iron levels and overall health status.