نبذة مختصرة : Introduction We aimed to evaluate the effectiveness of quadruple oral therapy in patients with inadequately controlled type 2 diabetes (T2D) with the use of three types of oral hypoglycemic agents. Methods Medical records of 318 patients with T2D who were prescribed quadruple therapy in the Asan Medical Center were reviewed. Changes in glycated hemoglobin (HbA1c) and fasting plasma glucose (FPG) levels from baseline were assessed. The regimens of quadruple oral therapy included the following: (1) thiazolidinedione (TZD) add-on to metformin (MET) + sulfonylurea (SU) + dipeptidyl peptidase 4 inhibitor (DPP4i), (2) sodium-glucose cotransporter 2 inhibitor (SGLT2i) add-on to MET + SU + DPP4i, and (3) DPP4i add-on to MET + SU + TZD. Results The TZD add-on significantly reduced HbA1c levels by 1.1% (from 9.0 ± 1.1 to 7.9 ± 1.1%, P
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