Abstract
Background: Glucagon-like peptide-1 receptor agonists (GLP-1RA) and dipeptidyl peptidase-4 inhibitors (DPP-4i) are incretin-based therapies commonly used in the management of type 2 diabetes. Public interest in GLP-1RA soared after discovering their ability to lower body weight in patients without diabetes. Objective: To examine recent trends in usage of GLP-1RA and DPP-4i in the Veterans Health Administration (VHA). Methods: We extracted GLP-1RA and DPP-4i use from the national VHA Corporate Data Workhouse (CDW) between fiscal years (FYs) 2011 to 2021, which encompass medication class, name, dosage, date of filled prescription, and patients' characteristics. Results: A total of 3 037 006 prescriptions for DPP-4i and 2 183 294 prescriptions for GLP-1RA were filled during FY 2011 to 2021. More patients were prescribed DPP-4i (273 002 subjects) compared with GLP-1RA (157 209 subjects) from FY 2011 to 2021. Overall, 10.7% used DPP-4i for 90 days or less in comparison to 9.1% in GLP-1RA (P < 0.001). The proportion of patients prescribed DPP-4i who were 75 years of age or older was relatively stable over the years 2011 to 2021 (mean proportion = 19%). However, the proportion of patients who were 75 years of age or older prescribed GLP-1RA increased from 4.2% in 2011 to 16.9% in 2021. Conclusions: Incretin-based therapies have become a well-established class of drugs within the VHA. Even though DPP-4i usage in older adults has remained stable over the past 10 years, prescriptions for GLP-1RA in older adults have increased multifold over the last few years, which might be attributed to recent trial evidence showing benefit in cardiovascular outcomes and weight reduction.