This is a single-center, randomized controlled clinical trial with a parallel-group design conducted at Minia University hospital.

All patients admitted to Diabetes clinics of Minia University Hospital, will be screened for the eligibility criteria.

diabetic patients (aged above 50 years) with uncontrolled diabetes on oral hypoglycemic drugs. 105 patients will be enrolled and randomized into three groups.

Group I=35 T2DM patients given DPP4Is Group II=35 T2DM patients given DPP4Is and metformin. Group III=35 patients will be given placebo (only adjust their drugs to control blood glucose level)

Inclusion Criteria:

Type-2 diabetic adult subjects (above 50 years old) who had uncontrolled (A1c=8-9 %) blood glucose levels with an oral hypoglycemic drug at the screening visit were eligible to participate.

Exclusion Criteria:

Those with type1 diabetes or ketoacidosis, end organ failure as chronic renal failure (estimated serum creatinine level ≥ 1.5mg/dl in male and ≥ 1.4mg/dl in female), liver cell failure (elevated alanine transaminase (ALT) and aspartate transaminase (AST) ≥ 2 folds), and heart failure, previous history of pancreatitis, and pregnant or lactating females were excluded from the study.

all patient information will be anonymized giving only corresponding numbers, which will be revealed by the PI after assessment.