Sulfonylureas are often added to metformin to improve glycemic control, but at the known risk of increasing hypoglycemia and weight gain. In a report published in the Lancet, more than 1,500 patients with type 2 diabetes taking metformin were randomized to the addition of either linagliptin, a dipeptidyl peptidase-4 inhibitor or the sulfonylurea glimepiride. After two years…

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