- Hypersensitivity to metformin or to any auxiliary substance;
- diabetic ketoacidosis, diabetic precoma, coma;
- renal failure or impaired renal function (creatinine clearance less than 60 ml / min);
- acute conditions that occur with a risk of developing renal dysfunction;
- Dehydration (with diarrhea, vomiting), fever, severe infectious diseases;
- the state of hypoxia (shock, sepsis, kidney infections, broncho-pulmonary diseases);
- clinically pronounced manifestations of acute and chronic diseases that can lead to the development of tissue hypoxia (including cardiac or respiratory failure, acute myocardial infarction);
- extensive surgery and trauma, when insulin therapy is indicated;
- liver failure, a violation of liver function;
- chronic alcoholism, acute alcohol poisoning;
- pregnancy, the period of breastfeeding;
- lactic acidosis (including in the anamnesis);
- use for at least 48 hours before and within 48 hours after carrying out radioisotope or X-ray studies with the introduction of iodine-containing contrast medium;
- compliance with the hypocaloric diet (less than 1000 kcal / day);
- Children under 18 years.