Canadian health officials have approved Merck’s Januvia (sitagliptin phosphate monohydrate), a once-daily, oral medication in a new class of anti-hyperglycemic agents known as DPP-4 (dipeptidyl peptidase-4) inhibitors. Januvia is approved in combination therapy with metformin, a commonly prescribed diabetes medication, to improve blood sugar (glucose) control in adult patients with type 2 diabetes when diet and exercise plus metformin do not provide adequate glycemic control.