DPP4 and type 2 diabetes mellitus: Dipeptidyl peptidase-4 (DPP-4) inhibitors are a class of oral antihyperglycemic agents for treatment of type 2 diabetes.4 Treatment with DPP-4 inhibitor alone or in combination with other antihyperglycemic agents can improve the success in achieving and/or maintaining glycemic control in patients with type 2 diabetes.