Is Iron Safe with Allopurinol?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Avoid routine high-dose iron supplementation unless iron deficiency is confirmed. Consult your physician before starting iron while on allopurinol.
Why this interaction occurs
Allopurinol inhibits xanthine oxidase, which plays a role in iron metabolism. Inhibition may reduce iron oxidation and promote accumulation of free iron, potentially increasing oxidative stress and the risk of iron overload in susceptible patients.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 160,463 reports mentioning Allopurinol. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Allopurinol + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Iron interactions → · All Allopurinol interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.