Association between kidney function and mortality among incident metformin users: a retrospective cohort study

Metformin is first-line therapy for people with type 2 diabetes. Due to potential lactic acidosis it is contraindicated in patients with estimated glomerular filtration rate (eGFR) < 60 mL/min/1.73m2, although little is known about its use among patients with chronic kidney disease (CKD). The objective of this study was to determine the association between kidney function and mortality among incident metformin users.