Ferrous fumarate Side Effects

For the Consumer

Applies to ferrous fumarate: chewable tablets, suspension

Check with your doctor if any of these most COMMON side effects persist or become bothersome:

Constipation; darkened or green stools; diarrhea; nausea; stomach upset.

Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); black, tarry stools; blood or streaks of blood in the stool; fever; vomiting with continuing sharp stomach pain.

For Healthcare Professionals

Applies to ferrous fumarate: compounding powder, oral liquid, oral suspension, oral tablet, oral tablet chewable, oral tablet extended release

Gastrointestinal

Frequency not reported: Nausea, vomiting, gastrointestinal discomfort, constipation, diarrhea, discolored (blackened) stools, tooth discoloration, anorexia, epigastric pain, fecal impaction^[Ref]

Hematologic

Frequency not reported: Hemosiderosis^[Ref]

Hypersensitivity

Frequency not reported: Allergic reaction^[Ref]

Not all side effects for ferrous fumarate may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

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