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Iron Supplementation

3 min read

Iron Supplementation

Key Points

  • Iron supplementation treats and prevents iron-deficiency anemia by restoring iron stores needed for hemoglobin synthesis.
  • Oral iron (ferrous sulfate) is best absorbed on an empty stomach with vitamin C to enhance absorption.
  • Common GI side effects include constipation, nausea, and black tarry stools (expected finding, not a sign of GI bleeding).
  • Parenteral iron (IV iron dextran, ferric carboxymaltose) is used when oral therapy is not tolerated or ineffective.

Mechanism of Action

Iron is an essential mineral required for hemoglobin synthesis and oxygen transport. Iron supplementation replaces depleted iron stores, allowing the bone marrow to produce adequate red blood cells with sufficient hemoglobin content.

Indications

  • Iron-deficiency anemia (treatment and prevention).
  • Increased iron demands during pregnancy, growth periods, and chronic blood loss.
  • Clients unable to absorb adequate iron from diet alone.

Nursing Considerations

  • Administer oral iron on an empty stomach for maximum absorption; if GI intolerance occurs, may take with small amount of food.
  • Give with vitamin C (orange juice) to enhance absorption; avoid taking with antacids, calcium supplements, dairy, or tea which decrease absorption.
  • Use a straw for liquid preparations to prevent tooth staining.
  • Monitor hemoglobin, hematocrit, and reticulocyte count to assess treatment response.
  • IV iron requires a test dose and close monitoring for anaphylactic reactions; have epinephrine and resuscitation equipment available.
  • Iron therapy typically continues for 3 to 6 months after hemoglobin normalizes to replenish iron stores.
  • Keep iron supplements out of reach of children; iron overdose is a leading cause of poisoning death in young children.

Side Effects and Adverse Effects

  • Common (oral): Constipation, nausea, abdominal cramping, black tarry stools (expected), metallic taste.
  • GI: Gastric irritation, diarrhea.
  • Serious (parenteral): Anaphylactic reaction (iron dextran), hypotension, chest pain.
  • Overdose: Toxic and potentially fatal, especially in children.

Iron Overdose

Iron poisoning is a leading cause of poisoning death in children under 6 years. All iron supplements must be stored in childproof containers out of reach.

Health Teaching

  • Black stools are an expected and harmless effect of oral iron; report any red or maroon stools.
  • Take iron on an empty stomach with vitamin C for best absorption.
  • Increase dietary fiber and fluid intake to manage constipation.
  • Do not take iron simultaneously with antacids, calcium, or dairy products; space by at least 2 hours.
  • Keep all iron supplements securely stored away from children.

Self-Check

  1. Why should oral iron be taken with vitamin C rather than with dairy products?
  2. What laboratory values indicate a therapeutic response to iron supplementation?
  3. Why is iron overdose particularly dangerous in young children?

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