Iron Deficiency Anemia Treatment
Key Differences
- Ferrous sulfate and ferrous gluconate are equally effective first-line oral iron supplements for treating iron deficiency anemia, with no substantial evidence that one is superior to the other in effectiveness, though they differ in elemental iron content, cost, and potentially in tolerability 1
- Ferrous sulfate contains approximately 65 mg of elemental iron per tablet, while ferrous gluconate contains 27-38 mg of elemental iron per tablet 2
- Ferrous sulfate is typically the least expensive option, with a cost of $0.30-$4.50 per 30 pills, compared to ferrous gluconate which costs $1.50-$3.30 per 30 pills 2
Clinical Recommendations
- The American Gastroenterological Association recommends starting with ferrous sulfate 200 mg once daily, as hepcidin elevation blocks further iron absorption for up to 48 hours after a single dose 1
- If ferrous sulfate is not tolerated, switching to ferrous gluconate or other ferrous salts is recommended, with lower doses potentially being as effective and better tolerated 1, 3, 4, 5
- Taking iron with meals improves tolerance but reduces absorption, while taking with meat protein and 500 mg vitamin C can improve absorption even with food 1
- Prescribing iron more than once daily should be avoided, as it increases side effects without improving absorption due to hepcidin upregulation 1
- Tea and coffee within one hour of iron intake should be avoided, as they are powerful inhibitors of iron absorption 1, 2
Common Pitfalls to Avoid
- Poor response to oral iron supplementation does not necessarily mean the formulation is ineffective, and adherence should be checked first, with hemoglobin expected to increase by 1 g/dL within 2 weeks and ferritin within a month 2