ClinCalc Pro
Menu
Oral ferrous iron

Ferrous sulfate

Brand names: Ferrograd

Adult dose

Dose: 200mg TDS (≈65mg elemental TDS); current evidence supports 200mg OD or alternate-day for many patients
Route: PO
Frequency: OD-TDS

Clinical pearls

  • Take on empty stomach with vitamin C if tolerated
  • Alternate-day dosing improves absorption per dose and reduces SE

Contraindications

  • Iron overload
  • Haemochromatosis

Side effects

  • GI upset (dose-related)
  • Black stools
  • Constipation

Interactions

  • Tetracyclines, quinolones, levothyroxine (separate by ≥2h)
  • Antacids/PPIs reduce absorption

Monitoring

  • Hb
  • Ferritin

Reference: BNF; NICE CKS iron-deficiency anaemia; https://bnf.nice.org.uk/drugs/ferrous-sulfate/. Verify against your local formulary and the latest BNF before prescribing.

Related

Curated clinical cross-links plus same-class fallbacks.