Introduction. To confirm the efficacy and safety of substituting teneligliptin with hydroxychloroquine in inadequately control type 2 diabetes patients (T2DM) despite treatment with teneligliptin, metformin and glimepiride with or without other antidiabetic therapy. Material and methods. This is a multicentre observational, retrospective, 24 week clinical study performed in type 2 diabetes patients with HbA1c in the range of 7.5% to 9.5%. This patients were on teneligliptin 20 mg in addition of metformin and glimepiride with or without other antidiabetic therapy. Teneligliptin 20 mg treatment was replaced by hydroxychloroquine 400 mg. The primary endpoint was change in fasting blood glucose (FBG), postprandial blood glucose (PPBG) and HbA1c from baseline to week 24. The secondary outcome of the study was the proportion of patients who achieved good glycaemic control (HbA1c < 7%) and change in estimated glomerular filtration rate (eGFR), blood urea, serum creatinine and lipid profile levels by the end of the study. Data was taken from patients medical records of the Hospital and Private clinic. Results. Total of 500 patients’ data was analysed and after 24 week of follow up these patients presented with significant decrease in HbA1c (–1.1 ± 0.17%; p = 0.000); FBG (–29.87 ± 8.9 mg/dl), PPBG (–56.89 ± 9.2 mg/dl) with 52% of patients had achieved HbA1c levels < 7% at the end of the study which confirmed superiority of switching to hydroxychloroquine from teneligliptin. It has also been observed that after the switch from teneligliptin to hydroxychloroquine there was no change in serum creatinine and eGFR and further statistically significant change in total cholesterol, triglycerides and LDL levels with marginal increase in HDL level. Conclusions. In T2DM patients inadequately controlled on teneligliptin 20 mg along with combination of metformin and glimepiride with or without other antidiabetic therapy, substitute with hydroxychloroquine 400 mg may be a simple yet effective therapeutic option with clinical benefit beyond strict glycemic control without compromising patient’s safety.