Discoloured faeces are a well-known adverse drug reaction of oral iron medications, but this is considered of no clinical relevance and is underreported. Other commonly seen side effects were gastrointestinal disorders (nausea, constipation, diarrhea and abdominal pain).
Very common: faeces discoloration.
Common: diarrhea, nausea, abdominal pain (including dyspepsia, epigastric discomfort, abdominal distension), constipation.
Uncommon: vomiting (including regurgitation), gastritis, tooth discoloration, pruritus, rash (including macular rash, blistered rash), urticaria, erythema, headache.
Rare: muscle spasms (including involuntary muscle contraction, tremor), myalgia.
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