Overview Sitagliptin Added-on to Insulin Study (0431-051) Status: Completed Trial end date: 2008-10-13 Target enrollment: Participant gender: Summary A clinical study to determine the safety and efficacy of sitagliptin in patients with Type 2 Diabetes Mellitus who have inadequate glycemic control on insulin or insulin/metformin combination therapy. Phase: Phase 3 Details Lead Sponsor: Merck Sharp & Dohme Corp.Treatments: Sitagliptin Phosphate