Fluoroquinolones represent an important class of antibacterial drugs and they are used worldwide because they have many advantages as a broad spectrum of activity, oral and intravenous formulations, high potency, high serum levels, large distribution volume, and good bioavailability. 1,2 However, fluoroquinolones may cause several side effects as tendon rupture, central nervous toxicity, cardiovascular toxicity, gastrointestinal toxicity, phototoxicity, disrupted glucose metabolism, skin disorders, and hypersensitivity. 3 The US Food and Drug Administration (FDA) suggested that the risk and benefits ratio of fluoroquinolones should be taken into consideration. 4 Cardiac side effects as the corrected QT interval (QTc) prolongation and torsade de pointes (Tdp) were the cause that some agents of fluoroquinolones were withdrawn from the market. However, still in clinical practice, there are agents of fluoroquinolones associated with these side effects as ciprofloxacin and levofloxacin. 5 Besides, several reports proved that fluoroquinolones may cause dysglycemic events in diabetic and non-diabetic patients. 6 Hyperglycemia events are more common with fluoroquinolones than with other classes of antibiotics. 7 In addition, FDA confirmed the current warning regarding the high risk of developing hypoglycemic events with fluoroquinolones may cause a decrease in blood sugar especially in diabetic patients. 8 When fluoroquinolones are used in diabetic patients, should monitor the blood glucose level continuously. 9 Besides, Diabetes mellitus (DM) is a major risk factor for cardiovascular diseases as QTc prolongation. 10,11 The QT interval represents both the depolarisation and repolarisation phase of the action potential of the