Overview Metformin Add-on Study in Patients With Type 2 Diabetes Mellitus (0431-020)(COMPLETED) Status: Completed Trial end date: 2007-02-02 Target enrollment: Participant gender: Summary The purpose of this study is to determine the safety and efficacy of an investigational drug in patients with type 2 diabetes mellitus. Phase: Phase 3 Details Lead Sponsor: Merck Sharp & Dohme Corp.Treatments: GlipizideMetforminPioglitazoneSitagliptin Phosphate