Not to be used in patients w/ type 1 diabetes or for diabetic ketoacidosis. Acute pancreatitis; promptly discontinue use & initiate appropriate management if pancreatitis is suspected. Hypoglycaemia could occur when caloric intake is deficient, strenuous exercise is not compensated by caloric supplementation or during concomitant use w/ other glucose-lowering agents (eg, sulphonylureas & insulin) or ethanol. Risk of lactic acidosis. Temporarily discontinue use in case of dehydration. Not recommended in patients w/ known mitochondrial diseases eg, mitochondrial encephalopathy w/ lactic acidosis & stroke-like episodes (MELAS) syndrome & maternal inherited diabetes & deafness (MIDD); immediately w/draw use & promptly perform diagnostic evaluation in case of signs & symptoms suggestive of MELAS syndrome or MIDD after metformin intake. Regular monitoring of cardiac & renal function in patients w/ stable chronic heart failure. Discontinue use at the time of surgery under general, spinal or epidural anaesth. Discontinue use if bullous pemphigoid is suspected. Monitor vit B
12 serum levels if vit B
12 deficiency (eg, anaemia or neuropathy) is suspected. Evaluate serum electrolytes & ketones, blood glucose & if indicated, blood pH, lactate, pyruvate & metformin levels in patients w/ previously well controlled type 2 diabetes who develops lab abnormalities or clinical illness; stop immediately & initiate other appropriate corrective measures if acidosis of either form occurs. Discontinue use prior to or at time of imaging procedure in patients w/ eGFR >60 mL/min/1.73 m
2; do not restart until at least 48 hr after, provided that renal function has been re-evaluated & found to be stable. Discontinue 48 hr before iodinated contrast media administration in patients w/ moderate renal impairment; do not reinstitute until at least 48 hr afterwards & only after renal function has been re-evaluated & not deteriorated further. Assess GFR before treatment initiation & regularly thereafter. Avoid use during pregnancy. Do not use during breast-feeding. Not recommended in childn & adolescents. Elderly >75 yr.