Monofer (iron isomaltoside 1000) is an intravenous iron replacement therapy used to treat iron deficiency conditions, particularly when oral iron supplements are ineffective, not tolerated, or when there is a clinical need to deliver iron rapidly to the body. It is commonly prescribed for patients with iron deficiency anemia, a condition characterized by a lack of red blood cells due to insufficient iron, which can lead to fatigue, weakness, and shortness of breath among other symptoms. Monofer works by replenishing the body's iron stores, allowing for the production of healthy red blood cells. It is often used in various patient groups, including those with chronic kidney disease, inflammatory bowel disease, and in women with heavy menstrual bleeding or postpartum iron deficiency. The administration of Monofer allows for a large dose of iron to be delivered directly into the bloodstream, offering a faster correction of iron deficiency than oral iron supplements.