NutriStack
Furosemide and Metformin, a caution.
Furosemide can cause volume depletion and renal impairment, which increases the risk of metformin-associated lactic acidosis. This is particularly relevant in elderly patients or those with borderline renal function.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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At a glance
- Substances
- Furosemide and Metformin
- Pair type
- Caution
- Evidence (highest tier)
- Moderate
- Source citations
- 2 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Moderate evidence
Caution
What is happening. Furosemide can cause volume depletion and renal impairment, which increases the risk of metformin-associated lactic acidosis. This is particularly relevant in elderly patients or those with borderline renal function.
Mechanism. Furosemide-induced volume depletion reduces renal perfusion and GFR. Reduced renal clearance of metformin leads to accumulation, increasing the risk of lactic acidosis, especially when combined with tissue hypoperfusion.
Recommendation. Monitor renal function regularly. Ensure adequate hydration. Consider holding metformin if signs of dehydration develop or if renal function declines.
Sources (2)
- DeFronzo R et al. Metformin-associated lactic acidosis: current perspectives. Clin Pharmacol Ther. 2016. PMID 26429791
- Maruthur NM, Tseng E, Hutfless S, Wilson LM et al.. Diabetes Medications as Monotherapy or Metformin-Based Combination Therapy for Type 2 Diabetes: A Systematic Review and Meta-analysis. Annals of Internal Medicine. 2016. PMID 27088241
Stack Score
How this pair moves the number.
Effect on the composite score
If both Furosemide and Metformin are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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