JAMA : the journal of the American Medical Association
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Metformin is the recommended initial drug therapy for patients with type 2 diabetes mellitus (DM). However, the optimal second-line drug when metformin monotherapy fails is unclear. ⋯ When added to maximal metformin therapy, all noninsulin antidiabetic drugs were associated with similar HbA(1c) reductions but differed in their associations with weight gain and risk of hypoglycemia.