Serious allergic & hypersensitivity reactions may occur eg, anaphylaxis, angioedema, & exfoliative skin conditions including SJS. Discontinue if pancreatitis, bullous pemphigoid is suspected. Discontinued at time of, or prior to, iodinated contrast imaging procedures. Lactic acidosis. Patients w/ known risk factors for heart failure. Severe & disabling arthralgia. Concomitant use w/ insulin &/or an insulin secretagogue. Acute renal failure. Not recommended in patients w/ eGFR 30-<45 mL/min/1.73 m
2. Not to be used in patients w/ eGFR <30 mL/min/1.73 m
2. Not recommended in pregnancy & lactation. Metformin: May lower vit B levels. Measure hematologic parameters annually & vit B at 2-3 yr intervals & manage any abnormalities.