Adult w/ normal renal function (GFR ≥90 mL/min) Monotherapy & in combination w/ other oral antidiabetics: Initially 500 or 850 mg bid-tid. Adjust dose based on blood glucose measurements after 10-15 days. Max recommended dose: 3 g daily, taken as 3 divided doses. Combination w/ insulin: Initially 500 or 850 mg bid-tid, while insulin is adjusted based on blood glucose measurements.
Adolescent & childn ≥10 yr Monotherapy & combination w/ insulin: Initially 500 or 850 mg once daily. Adjust dose based on blood glucose measurements after 10-15 days. Max recommended dose: 2 g daily, taken as 2-3 divided doses.
Patient w/ renal impairment GFR 60-89 mL/min Total max daily dose: 3,000 mg divided in 2-3 daily doses,
GFR 45-59 mL/min Total max daily dose: 2,000 mg divided in 2-3 daily doses,
GFR 30-44 mL/min Total max daily dose: 1,000 mg divided in 2-3 daily doses.