Sitagliptin 100mg Tablet is a medication used to treat type 2 diabetes mellitus, combining a healthy diet and regular exercise to control blood sugar levels and prevent complications like kidney damage and blindness. It is prescribed when diet and exercise alone are insufficient. The dosage depends on the patient's condition and blood sugar levels. Regular, consistent use is recommended. Side effects include headaches, hypoglycemia, and upper respiratory tract infections. Before taking this medication, inform your doctor about any medical history, including kidney, heart, or pancreas problems, and if you are pregnant or breastfeeding. Limit alcohol intake and monitor kidney function and blood glucose levels regularly.