Treatment of Anemia in Menorrhagia

Immediate Iron Replacement Strategy

The American College of Physicians recommends starting oral ferrous sulfate 200 mg once daily immediately to treat iron deficiency anemia secondary to menorrhagia, as this is the most cost-effective first-line treatment 1
Once-daily dosing is superior to multiple daily doses because it improves gastrointestinal tolerance while maintaining equal or better iron absorption due to hepcidin regulation 1
Adding vitamin C (ascorbic acid) 500 mg with each iron dose enhances absorption, particularly important when iron stores are severely depleted 2, 1
Alternative formulations (ferrous gluconate or ferrous fumarate) are equally effective if ferrous sulfate is not tolerated 2, 1
Iron therapy should be continued for 3 months after hemoglobin normalizes to fully replenish body iron stores, which is critical to prevent recurrence 3

Hemoglobin should rise by approximately 2 g/dL after 3-4 weeks of treatment 2, 1
Hemoglobin and red cell indices should be monitored at 3-month intervals for the first year, then again after another year 3
If hemoglobin or MCV falls below normal during follow-up, iron supplementation should be restarted (and ferritin checked in doubtful cases) 3

Intravenous iron should be considered if the patient cannot tolerate at least two different oral iron preparations, or if oral iron fails to improve ferritin levels after 4 weeks of compliant therapy 1
All IV iron formulations have similar safety profiles, with true anaphylaxis being rare (0.6-0.7%) 1

While treating anemia, the underlying menorrhagia should be simultaneously addressed to prevent recurrence of iron deficiency 2, 1
Menstrual blood loss can be quantified using pictorial blood loss assessment charts, which have 80% sensitivity and specificity for detecting menorrhagia 2

Multiple daily doses of oral iron should not be prescribed, as this increases gastrointestinal side effects without improving efficacy due to hepcidin-mediated absorption blockade 1
Iron therapy should not be stopped when hemoglobin normalizes; it should be continued for 3 months to replenish stores, as premature discontinuation leads to recurrence 3
Parenteral iron should not be used as first-line unless there is documented intolerance to at least two oral preparations 2, 3
Vitamin C supplementation should not be overlooked when oral iron response is suboptimal 2, 1

If hemoglobin fails to rise by 2 g/dL after 4 weeks despite compliant oral iron therapy, the patient's adherence to therapy should be verified, and continued menstrual blood loss and malabsorption should be assessed 1, 2
If anemia does not resolve within 6 months despite appropriate iron therapy and menorrhagia control, ongoing occult blood loss from gastrointestinal sources should be reassessed, and further investigation with upper endoscopy and colonoscopy may be necessary 2, 3

For women under 45 years with menorrhagia-related anemia, focus on treating menorrhagia and iron deficiency, with gastrointestinal investigation only needed if upper GI symptoms are present 2
For women over 45 years with iron deficiency anemia, a full gastrointestinal evaluation (upper endoscopy with small bowel biopsy and colonoscopy) should be performed, even if menorrhagia is present, due to the increasing incidence of gastrointestinal pathology with age 2