Safety and efficacy of treatment with sitagliptin or glipizide in patients with type 2 diabetes inadequately controlled on metformin: a 2-year study.
OBJECTIVES: To evaluate the 2-year safety and efficacy of adding sitagliptin or glipizide to ongoing metformin in patients with type 2 diabetes. METHODS: Patients who were on a stable dose of metformin (> or = 1500 mg/day) for at least 8 weeks were random.....