Iron supplement drug for medicine
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"iron deficiency anemia"[MeSH Terms] AND "iron supplementation"[MeSH Terms]
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"iron deficiency" AND "treatment" AND "oral intravenous"
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Here is a complete overview of iron supplement drugs used in medicine:
Iron Supplement Drugs in Medicine
Why Iron Is Needed
Iron deficiency anemia is the most common nutritional deficiency worldwide. It occurs when iron stores are depleted, leading to reduced hemoglobin synthesis. Common causes include dietary deficiency, chronic blood loss (menorrhagia, GI bleeding), pregnancy, malabsorption (celiac disease, post-bariatric surgery), and inflammatory bowel disease.
Mechanism of Action
Supplemental iron corrects iron deficiency by providing elemental iron for hemoglobin synthesis. Iron must be in the reduced ferrous (Fe²⁺) form for optimal absorption, which occurs primarily in the duodenum. Acidic gastric conditions keep iron in this soluble form. The amount absorbed is regulated by body stores - if stores are low, more is absorbed; if adequate, less is absorbed.
- The CDC recommends 60-120 mg/day of elemental iron in divided doses (2-3x daily) for iron deficiency anemia
- In pregnant women: 30 mg/day for nutritional support
- Emerging evidence suggests every-other-day dosing is as effective as daily dosing with fewer side effects
- Higher doses (>60-120 mg/day) do not improve absorption and may paradoxically decrease it
Oral Iron Preparations
These are first-line for most patients. The percentage of elemental iron differs by compound:
| Preparation | Brand Names | Elemental Iron (%) | Notes |
|---|---|---|---|
| Ferrous sulfate | Fer-in-Sol, Feratab | 20% | Most common; 325 mg tablet = 65 mg elemental iron |
| Ferrous gluconate | Fergon, Ferro-Tab | 12% | Less elemental iron per tablet; better tolerated |
| Ferrous fumarate | - | 33% | Highest elemental iron content |
| Ferric ammonium citrate | Iron citrate | 18% | Less bioavailable than ferrous salts |
| Polysaccharide-iron complex | - | Variable | Less GI irritation |
| Carbonyl iron | - | ~100% | Slow release; fewer GI effects |
| Iron bisglycinate | - | - | Typical dose: 25 mg elemental iron |
Absorption tips:
- Take on an empty stomach or with meat protein (beef, pork, fish) for best absorption
- Vitamin C enhances absorption
- Avoid calcium, fiber, tea (reduces absorption by 90%), and coffee (reduces by ~60%) at the same time
Response timeline:
- Reticulocyte count rises within 1 week
- Hemoglobin starts rising by week 2
- Continue until ferritin is 50-100 ng/dL (stores fully replete)
GI Side Effects of Oral Iron
30-50% of patients report GI symptoms including stomach pain, constipation, nausea, and esophageal irritation. Strategies to reduce side effects:
- Use lower elemental iron doses
- Switch to every-other-day dosing
- Try ferrous gluconate if ferrous sulfate is not tolerated
Intravenous (Parenteral) Iron Preparations
Used when oral iron fails, is not tolerated, or absorption is impaired.
Indications for IV iron:
- No hemoglobin response within 2 weeks of oral iron
- Ongoing blood loss too rapid for oral replacement
- Inflammatory bowel disease or bowel resection
- Bariatric surgery (preferred route)
- Pregnancy (superior to oral iron)
- H. pylori infection or celiac disease causing malabsorption
| Agent | Typical Dose | Administration |
|---|---|---|
| Ferric carboxymaltose (Injectafer) | 750 mg x2 (1 week apart) | IV infusion |
| Ferric derisomaltose (Monoferric) | Up to 1000 mg | IV over 20 min |
| Ferumoxytol (Feraheme) | 510 mg x2 (3-8 days apart) | IV over 15 min |
| Low MW iron dextran | 1000 mg single dose | IV over 1 hour |
| Sodium ferric gluconate | Variable | IV infusion |
| Iron sucrose (Venofer) | Variable | IV infusion |
Note: Patients who received ferumoxytol must inform their doctors before MRI scans, as it acts as an MRI contrast agent.
Special Populations
- Pregnancy: 30 mg/day elemental iron to meet increased needs; IV iron preferred if oral not tolerated
- Children: During accelerated growth phases; watch for pica (cravings for dirt, ice, paper) and koilonychia (spoon-shaped nails) as signs of deficiency
- Malabsorption (post-bariatric, celiac): IV iron is preferred
- Chronic kidney disease: IV iron alongside erythropoiesis-stimulating agents
Distinguishing Iron Deficiency from Other Anemias
| Test | Iron Deficiency | Anemia of Chronic Inflammation | Sideroblastic Anemia |
|---|---|---|---|
| Serum iron | Decreased | Decreased | Often increased |
| TIBC | Increased | Decreased | Normal |
| Transferrin saturation | <16% | <30% | >45% |
| Ferritin | <15 ng/mL | >200 ng/mL | >200 ng/mL |
Sources: Lippincott Illustrated Reviews: Pharmacology, pp. 1477-1479; Goldman-Cecil Medicine, pp. 1681-1682
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