Medical Uses of Iron: From Anemia Treatment to MRI Contrast

Iron's biological role in oxygen transport and cellular metabolism underpins its diverse medical applications.

1. Iron Deficiency Anemia Treatment

• Oral iron: Ferrous sulfate, gluconate, fumarate (first-line).
• IV iron: Iron sucrose, ferric carboxymaltose, iron isomaltoside—for intolerance, malabsorption, rapid repletion needs.

2. Supplementation & Fortification

• Multivitamins with iron (prenatal, pediatric, geriatric formulations).
• National fortification programs: wheat flour, rice, salt, cooking oil.

3. Diagnostic Assessment

• Serum iron, ferritin, transferrin saturation, TIBC—evaluate iron stores.
• Distinguishes iron deficiency anemia from anemia of chronic disease, thalassemia.

4. MRI Contrast Agents

• Superparamagnetic iron oxide (SPIO) nanoparticles (e.g., ferumoxytol).
• Liver/spleen imaging, lymph node mapping, off-label CNS perfusion.

5. Iron-Based Therapeutics

• IV iron sucrose: Repletion in hemodialysis-associated anemia.
• Iron chelators: Deferoxamine, deferiprone, deferasirox—for transfusional iron overload (thalassemia, sickle cell).

6. Emerging Applications

• Iron oxide nanoparticles for targeted drug delivery, hyperthermia cancer therapy.
• Hepcidin modulators for anemia of inflammation.

Iron therapy requires monitoring for overload (ferritin, transferrin saturation) and adverse effects (GI intolerance, hypersensitivity with IV).