Is Creatine Safe with Metformin?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Inform your physician if you are taking creatine supplements, as this will artificially elevate serum creatinine and may prompt unnecessary metformin dose reductions or discontinuation. Cystatin-C based GFR estimation may be preferred for monitoring.
Why this interaction occurs
Metformin is contraindicated or requires dose adjustment when eGFR falls below 30 mL/min due to risk of lactic acidosis. Creatine supplementation raises serum creatinine independently of true kidney function, potentially causing a false indication of renal impairment that could lead to inappropriate metformin discontinuation or clinical mismanagement.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 432,898 reports mentioning Metformin. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Metformin + 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 Creatine interactions → · All Metformin interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.