Gliclazide is an anti-diabetic medicine used to reduce blood sugar levels in type 2 diabetes mellitus when diet, physical activity, and weight loss are insufficient. It is used in individuals with type 2 diabetes to enhance blood sugar management in conjunction with diet and exercise. It works by boosting the quantity of insulin generated by the pancreas in order to reduce blood sugar levels. Gliclazide can sometimes make your blood sugar level too low. This can affect your concentration. There are things you can do to help cope with these common side effects of gliclazide stomach ache or indigestion, feeling sick, vomiting, and constipation.