It is used with diet and exercise: • in patients who are not satisfactorily controlled on metformin (an antidiabetes medicine) alone; • in patients who are already taking a combination of sitagliptin and metformin as separate tablets; • in combination with a sulphonylurea (another type of antidiabetes medicine) when the combination of a sulphonylurea and metformin is not sufficient to give satisfactory control of the patient’ s diabetes.