Used to manage type 2 diabetes by improving glycemic control. Sitagliptin is a DPP-4 inhibitor that works by increasing insulin release when blood glucose levels are high and reducing glucose production in the liver, especially after meals. Typically prescribed as an oral tablet, it is often used alongside diet and exercise. May be combined with other antidiabetic medications like metformin for enhanced effect. Helps lower HbA1c levels without causing significant weight gain, making it a favorable option in long-term diabetes treatment.