Sitagliptin 100mg Tablet is prescribed when diet and exercise, or other medications, fail to adequately control blood sugar levels. It can be taken on an empty stomach or with a meal, as directed by your doctor. Consistent use is essential to prevent complications and maintain blood sugar levels. Common side effects include headaches and upper respiratory tract infections. Inform your doctor about any existing medical conditions, medications, or alcohol consumption. Regular monitoring may be necessary to ensure effectiveness and safety.