Initial Treatment for Iron Deficiency Anemia

Oral Iron Therapy

The initial treatment for iron deficiency anemia should be oral iron supplementation with one tablet daily of ferrous sulfate, ferrous fumarate, or ferrous gluconate, as recommended by the American Gastroenterological Association 1
Oral iron should be continued for approximately 3 months after normalization of hemoglobin levels to ensure adequate repletion of marrow iron stores, based on guidelines from the American Gastroenterological Association 1, 2
Taking iron on an empty stomach when possible maximizes absorption, according to the American Gastroenterological Association 3
Adding vitamin C (ascorbic acid) enhances iron absorption and should be considered, especially when response is poor, as recommended by the American Gastroenterological Association 2, 4

Monitor hemoglobin response within the first 4 weeks of starting oral iron therapy, as recommended by the American Gastroenterological Association 1
Hemoglobin should rise by approximately 2 g/dL after 3-4 weeks of therapy, based on guidelines from the American Gastroenterological Association 5
Failure to respond is usually due to poor compliance, misdiagnosis, continued blood loss, or malabsorption, according to the American Gastroenterological Association 5

Intravenous iron should be considered when oral iron is not tolerated despite trying different formulations, as recommended by the American Gastroenterological Association 1, 6
Intravenous iron should be considered when ferritin levels do not improve with an adequate trial of oral iron, based on guidelines from the American Gastroenterological Association 6
Intravenous iron should be considered in conditions where oral iron absorption is likely to be impaired (e.g., inflammatory bowel disease with active inflammation), as recommended by the American Gastroenterological Association 7, 5

In women without obvious causes, evaluation of menstrual blood loss should be considered, though history alone is unreliable in quantifying menstrual loss, according to the American Gastroenterological Association 2
For women aged less than 45 years without upper GI symptoms, extensive gastrointestinal investigation may not be necessary initially, as recommended by the American Gastroenterological Association 2