Linagliptin for Type 2 Diabetes Mellitus: A Systematic Review of Efficacy, Safety, Combination Therapy, and Use in High Risk Populations. Faculty of Medicine, Tadulako University, P-ISSN: 2407-8441 and e-ISSN 2502-0749. 2026;12(3):455-466. doi:10.22487/vytnfy72