Lactic Acidosis Risk in Diabetes Treatment

Metformin and Lactic Acidosis

• The American Diabetes Association recommends metformin as a first-line treatment for type 2 diabetes, but it carries a risk of lactic acidosis, a rare but serious side effect, with an incidence rate of less than 1 case per 100,000 patient-years 1, 2
• Metformin is contraindicated in patients with an estimated glomerular filtration rate (eGFR) below 30 ml/min/1.73 m² due to the risk of lactic acidosis, as it is primarily excreted by the kidneys 3, 4

Clinical Implications

• The National Kidney Foundation recommends that metformin be used with caution in patients with renal impairment (eGFR <30 ml/min/1.73 m²) or acute illnesses, such as sepsis, fever, diarrhea, or vomiting 3, 6
• The American Journal of Kidney Diseases suggests that imiglimin may be a safer alternative to metformin in patients with renal impairment or at risk of acute illnesses 6

Patient Education

• The American Diabetes Association emphasizes the importance of educating patients on the "Sick Day Rule" when using metformin, which includes temporarily discontinuing the medication during acute illnesses 5