Iron Supplementation Guidelines

Administration and Absorption

Crushing or chewing iron tablets can cause tooth staining, mouth irritation, and may alter the intended absorption profile of the medication 1
For optimal absorption, iron supplements should ideally be taken on an empty stomach, but can be taken with food if gastrointestinal side effects occur 1

Standard dosing for iron deficiency is typically 50-100 mg of elemental iron daily 1
A hemoglobin increase of at least 10 g/L after 2 weeks of daily oral iron therapy indicates an adequate response 1
Regular hemoglobin monitoring (approximately every 4 weeks) is recommended until normal range is achieved 1
After hemoglobin normalization, oral iron should be continued for 2-3 months to replenish iron stores 1
Failure to respond to oral iron may indicate non-compliance, malabsorption, continued bleeding, or other underlying conditions 1

Discontinuing iron therapy prematurely before iron stores are fully replenished can be a common pitfall 1

For patients with inactive inflammatory bowel disease (IBD), no more than 100 mg elemental iron should be taken daily, making every-other-day dosing a reasonable strategy, as recommended by the Gut society 2
In patients with active inflammatory disease, oral iron tablets should not be used because systemic inflammation inhibits iron absorption, according to the Gut society 2
If gastrointestinal side effects occur with daily dosing, reducing to one tablet every other day is an acceptable alternative before considering parenteral iron, as suggested by the Gut society 2

In patients with heart failure and iron deficiency with or without anemia, intravenous iron replacement is reasonable to improve functional status and quality of life, as recommended by the American Heart Association, published in Circulation 3