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Hypersensitivity to metformin or to any of the excipients.
Any type of acute metabolic acidosis (such as lactic acidosis, diabetic ketoacidosis).
Diabetic pre-coma.
Severely reduced kidney function (GFR <30 mL/min).
Acute conditions with the potential to alter renal function such as: dehydration, severe infection, shock.
Disease which may cause tissue hypoxia (especially acute disease, or worsening of chronic disease) such as: decompensated heart failure, respiratory failure, recent myocardial infarction, shock.
Hepatic insufficiency, acute alcohol intoxication, alcoholism.
