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Ferric maltol Side Effects

Medically reviewed by Last updated on Mar 22, 2024.

Applies to ferric maltol: oral capsule.

Serious side effects of Ferric maltol

Along with its needed effects, ferric maltol may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Get emergency help immediately if any of the following symptoms of overdose occur while taking ferric maltol:

Symptoms of overdose

Other side effects of Ferric maltol

Some side effects of ferric maltol may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Less common

For Healthcare Professionals

Applies to ferric maltol: oral capsule.


The most common adverse events were gastrointestinal symptoms (abdominal pain, flatulence, constipation, abdominal discomfort/distension, diarrhea), mostly of mild to moderate severity.[Ref]


Common (1% to 10%): Abdominal pain, flatulence, constipation, abdominal discomfort/distension, diarrhea, nausea, faeces discolored, vomiting

Uncommon (0.1% to 1%): Small intestinal bacterial overgrowth[Ref]


Uncommon (0.1% to 1%): Acne, erythema[Ref]


Uncommon (0.1% to 1%): Gamma-glutamyltransferase increased[Ref]


Uncommon (0.1% to 1%): Blood alkaline phosphatase increased[Ref]


Uncommon (0.1% to 1%): Thirst[Ref]


Uncommon (0.1% to 1%): Joint stiffness, pain in extremity[Ref]

Nervous system

Uncommon (0.1% to 1%): Headache[Ref]


Uncommon (0.1% to 1%): Blood thyroid stimulating hormone increased[Ref]


1. Cerner Multum, Inc. "UK Summary of Product Characteristics."

2. (2021) "Product Information. Accrufer (ferric maltol)." Shield Therapeutics

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.