Drug interactions
Ethanol + Metformin
Severity: Major
Ethanol and Metformin: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Excessive alcohol intake potentiates the effect of metformin on lactate metabolism and increases the risk of lactic acidosis. Alcohol also increases hypoglycemia risk, especially with fasting.
What this interaction means in plain words
Ethanol and Metformin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Alcohol impairs hepatic lactate clearance and adds to metformin-related inhibition of gluconeogenesis.
What to do
Counsel patients to avoid binge or excessive alcohol use; reassess metformin in patients with alcohol use disorder.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Metformin
Frequently asked questions
Can I take Ethanol with Metformin?
MediHelp rates the interaction as major. Ethanol and Metformin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Excessive alcohol intake potentiates the effect of metformin on lactate metabolism and increases the risk of lactic acidosis. Alcohol also increases hypoglycemia risk, especially with fasting.
How serious is the interaction between Ethanol and Metformin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Counsel patients to avoid binge or excessive alcohol use; reassess metformin in patients with alcohol use disorder.
What other medicines interact with Metformin?
MediHelp also lists interactions of Metformin with, for example, Contrast media, Diatrizoate meglumine / diatrizoate, Diatrizoate. The full list is on the Metformin page.
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