DrugPair interaction guide

Metformin and Alcohol

Metformin is one of the most common diabetes medicines. Drinking alcohol while on metformin can cause blood sugar swings and in some cases raise the risk of lactic acidosis.

Moderate interaction

Use with caution — ask your doctor or pharmacist.

What you need to know

Alcohol lowers blood sugar independently of metformin, which can lead to hypoglycemia. Heavy drinking also raises lactate levels, which combined with metformin can cause lactic acidosis. Occasional light drinking is often tolerated, but binge drinking and chronic heavy drinking are not safe with metformin.

What to do

Limit alcohol to one standard drink per occasion and avoid drinking on an empty stomach.

Never drink to the point of intoxication while on metformin.

Eat before or during drinking to help stabilise blood sugar.

When to call your doctor

Symptoms of low blood sugar: shakiness, sweating, confusion, fast heartbeat.

Muscle pain, weakness, or difficulty breathing — possible signs of lactic acidosis.

Sources:FDANIH MedlinePlusAmerican Diabetes Association

DrugPair provides educational safety information only and is not a substitute for professional medical advice. Always ask a doctor or pharmacist before changing medicines, supplements, food, drinks, or prescription timing.

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