Combining GLP-1 Receptor Agonists and SGLT2 Inhibitors in Type 2 Diabetes Mellitus: A Scoping Review and Expert Insights for Clinical Practice Utilizing the Nominal Group Technique

Introduction: Treating type 2 diabetes has shifted from a gluco-centric approach to broader cardio-renal-metabolic strategy, driven by the use of disease-modifying medications. Traditionally, diabetes management has relied on stepwise medication addition based on failures in glucose control. However, the benefits and risks of combining glucagon-like peptide-1 receptor agonists (GLP1-RAs) and sodium-glucose cotransporter 2 inhibitors (SGLT2is) remain inadequately understood. Methods: This study conducted a scoping review to examine the available clinical research on the benefits and risks of combining GLP1-RAs and SGLT2is. Additionally, the nominal group technique was used to gather insights from medical experts from different areas regarding the combined therapy’s daily clinical use, concerns, and limitations. The review followed the guidelines outlined in the Joanna Briggs Institute Reviewer’s Manual and the PRISMA-ScR (Preferred Reporting Items for Systematic Reviews and Meta-Analyses Extension for Scoping Reviews). Results: The final report includes 50 studies. The most common designs are observational studies. The median (IQR) number of patients across studies was 355 (1295). Studies reporting metabolic outcomes were the most common. The follow-up time ranges from 1.5 to 60 months. Although limited, the available evidence seems to support the combined use of GLP1-RAs and SGLT2is. The experts agreed that the underlying mechanisms appear synergistic rather than antagonistic for most outcomes. Conclusions: Combining medical therapy is common in diabetes treatment and may occur naturally in everyday practice. Limited evidence suggests that combined SGLT2is/GLP1-RAs therapy can potentially improve most but not all outcomes. Quality evidence and better-defined outcomes are paramount to guide the selection of patients for combined therapy.