Is Vitamin C Safe with Allopurinol?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Vitamin C supplementation (500–1000mg/day) may be a beneficial adjunct to allopurinol but should be discussed with your physician to ensure uric acid levels are appropriately monitored.
Why this interaction occurs
Vitamin C has demonstrated mild uricosuric effects by increasing renal uric acid excretion. When combined with allopurinol, there may be an additive urate-lowering effect, which is generally beneficial but warrants monitoring to avoid excessive uric acid reduction.
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 Vitamin C interactions → · All Allopurinol interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.