“…add-on) with metformin include oral agents (DPP-4 inhibitors, SGLT2 inhibitors, sulfonylureas, TZDs), injectable glucagonlike peptide 1 (GLP-1) agonists, or basal insulin [10]. Many drug classes are available in the United States as FDC products containing metformin immediate release or metformin extended release [6], including combinations with DPP-4 inhibitors (sitagliptin [41,42], linagliptin [43], saxagliptin [44], and alogliptin [45]), sulfonylureas (glipizide [46] and glyburide [47]), SGLT2 inhibitors (dapagliflozin [48], canagliflozin [49], empagliflozin [50]), a meglitinide (repaglinide [51]), and a TZD (pioglitazone [52,53]). …”