Management of Iron Deficiency Anemia in Patients with Dementia

Initial Treatment Strategy

The American Gastroenterological Association recommends starting with oral iron supplementation using ferrous sulfate 200 mg once daily, adding vitamin C to enhance absorption, and considering intravenous iron if oral therapy fails or is not tolerated 1
Oral iron therapy should begin with ferrous sulfate 200 mg once daily, with the option for alternate-day dosing if better tolerated, and vitamin C 500 mg should be added with each iron dose to improve absorption 1, 2
Alternative formulations such as ferrous gluconate or ferrous fumarate can be used if ferrous sulfate is not tolerated, and liquid preparations may be better tolerated in patients with swallowing difficulties 3, 4

Hemoglobin levels should rise by 2 g/dL after 3-4 weeks of treatment, and oral iron should be continued for 3 months after hemoglobin normalizes to replenish iron stores 3, 4, 2
Hemoglobin and ferritin levels should be monitored every 3 months for the first year, then annually 2

Intravenous iron should be considered if there is intolerance to at least two different oral iron preparations, ferritin levels do not improve after an adequate trial of oral iron, or conditions where oral iron absorption is compromised 1, 2
The preferred intravenous formulations should replace iron deficits with 1-2 infusions rather than multiple infusions, and true anaphylaxis is very rare, with most reactions being complement activation-related pseudo-allergy (infusion reactions) 1, 5

All patients require evaluation for the source of iron deficiency, including upper endoscopy with small bowel biopsy and colonoscopy or barium enema unless a firm cause is identified with the first investigation 3, 4, 2
Celiac disease screening with antiendomysial antibodies and IgA levels should be considered 3, 4

Simplified once-daily or alternate-day dosing improves compliance compared to three-times-daily regimens, and liquid formulations may be necessary if swallowing difficulties exist 1, 3, 4
Consider intravenous iron earlier if compliance is unreliable, as untreated iron deficiency can worsen cognitive symptoms 1

Premature discontinuation before iron stores are replenished leads to rapid recurrence, and prescribing excessive daily doses (>200 mg) increases side effects and paradoxically reduces absorption due to hepcidin elevation 1, 2
Failing to investigate for GI pathology in older patients, assuming dietary insufficiency alone, and not recognizing that continued blood loss will prevent response regardless of supplementation 3, 4, 2