Study to Evaluate the Long Term Safety and Efficacy of DWP16001 in Patients With Type 2 Diabetes Mellitus

The subjects, having voluntarily agreed to participate in the clinical trial and provided informed consent, will undergo screening tests. During Visit 1 (Screening), subjects meeting the inclusion/exclusion criteria will go through an 8-week stabilization period. Throughout this period, subjects will receive concurrent administration of metformin (≥1,000 mg/day) and gemigliptin (50 mg/day), and will have a washout period for other oral antidiabetic drugs. At Visit 1-1, central laboratory tests will be conducted. If the test results meet the criteria for Visit 2 (Enrollment Visit), the subject will be eligible to participate in the clinical trial. The subjects will receive the investigational drug (DWP16001 0.3 mg) once a day for 52 weeks. They will visit the clinical trial site at weeks 8, 16, 24, 38, and 52 for safety and efficacy assessments during the 52-week treatment period.