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In a recent randomized trial, the diabetes drug saxagliptin (Onglyza; a dipeptidyl peptidase (DPP)-4 inhibitor) was associated with a modest but statistically significant increase in hospital admissions for heart failure (NEJM JW Gen Med Oct 1 2013 and N Engl J Med 369:1317). Now, industry-supported researchers have examined the cardiovascular safety of another DPP-4 inhibitor, sitagliptin (Januvia), in nearly 15,000 type 2 diabetic patients with established cardiovascular disease and glycosylated hemoglobin (HbA1c) levels of 6.5% to 8.0% while taking one or two glucose-lowering agents. Patients were randomized to add either sitagliptin or placebo to their diabetes regimens, and treating clinicians were encouraged to adjust regimens to achi…