- Participants with type 2 diabetes mellitus for at least 6 months before entering the trial based on the disease diagnostic criteria (World Health Organization [WHO]) classification managed with diet or exercise alone or with a stable dose of metformin of at least 1000 mg/day for at least 60 days before screening or on metformin and an eligible second oral anti-hyperglycemic medication after a 60-day washout of the second oral anti-hyperglycemic medication