Last updated: Lesson of the Month - January 2019…
on 01 Jan 2019

Iron (Oral)

  • Iron deficiency anaemia

  • Ferrous sulphate 200 mg (60 mg iron)
  • Ferrous gluconate (35 mg)
  • Ferrous fumarate 210 mg (68 mg)

  • Haemochromatosis
  • Patients with hypersensitivity to any of the excipients

  • Exclude underlying cause of anaemia, eg chronic GI bleeding

  • Nausea, constipation or diarrhoea
  • Black stools

  • One tablet TDS

  • As in normal renal function

  • Reduced absorption of levothyroxine, ciprofloxacin, mycophenolate mofetil and calcium
  • Cholestyramine may reduce the absorption of iron. Ideally give doses at least two hours apart


  • Take at a time away from food to get maximal absorption. If feel nauseous, take with food to reduce this symptom
  • May cause black stools
  • Overdose in children can be fatal
  • Take at least one to two hours away from calcium based phosphate binders, tea, coffee and milk