Metformin-Associated Lactic Acidosis Risk Factors and Management

Risk Factors

• Renal impairment is the primary risk factor for metformin-associated lactic acidosis, as metformin is substantially excreted by the kidney, with the risk increasing with the severity of renal impairment, particularly when eGFR falls below 30 mL/min/1.73 m² 1, 2
• The American Diabetes Association, as reported in Diabetes Care, recommends careful dose adjustment and monitoring for patients with eGFR between 30-45 mL/min/1.73 m² 2

Incidence and Mortality

• Conditions with tissue hypoxia, such as sepsis, shock, or heart failure, are risk factors for lactic acidosis, although the source of this information is not a primary guideline society 3