- At Visit 2/Period 1/Day 1, subjects will have been treated for their diabetes by metformin (≥1000 mg/day; any type and regimen), metformin and a DPP-4 inhibitor ( Dipeptidyl-Peptidase)-4), metformin and an SGLT-2 (Sodium-glucose co-transporter 2) inhibitor, metformin and TZD (Thiazolidinediones), or metformin and sulfonylurea. Subjects will have been on a stable regimen of metformin (defined as the same metformin dose and type) and other treatments for at least 8 weeks prior to Visit 2/Period 1/Day 1.