Abstract 01: Association of Copayment Level and Glucagon-Like Peptide-1 Receptor Agonist and Sodium-Glucose Cotransporter 2 Inhibitor Adherence in Diabetes and Heart Failure

Abstract

Introduction: Diabetes and heart failure (HF) rates are rising. Glucagon-like peptide-1 receptor agonists (GLP1RA) and sodium-glucose cotransporter 2 inhibitors (SGLT2i) are associated with improved outcomes in these conditions. Out-of-pocket cost may reduce medication adherence. We examined the association of medication copayment with 1-year adherence to these agents in individuals with diabetes and HF. Hypothesis: Individuals with high copayments have reduced adherence to GLP1RAs and SGLT2is. Methods: Using the Optum de-identified Clinformatics Data Mart Database, individuals with diabetes and HF and ≥12 months of enrollment with a GLP1RA or SLGT2i claim from 2014-2021 were included. We defined adherence as the proportion of days covered (PDC) ≥80%. We used multivariable logistic regression models to examine the adjusted odds of adherence by copayment level, defined as low (<$10 USD), medium ($10-<$50), and high (≥$50). Covariates included patient socioeconomic and clinical comorbidities. Results: We identified 94,610 individuals (age 61.8±11.4 years; 45.9% female) prescribed GLP1RAs or SGLT2is from 1/1/2014-9/30/2020, Overall, 39,149 individuals had a claim for a GLP1RA, of whom 25,557 (65.3%) had PDC ≥80%. In fully adjusted models, individuals with medium (adjusted odds ratio, aOR 0.61, 95% CI, 0.57-0.66) and high copayment (aOR 0.48, 95% CI, 0.44-0.51) were less likely to have PDC ≥80% with GLPRAs compared to those with low copayment ( Figure ). Overall, 51,072 individuals had a claim for an SGLT2i, of whom 37,339 (73.1%) individuals had PDC ≥80% at 1 year. Individuals with medium (aOR 0.67, 95% CI, 0.62-0.71) and high copayment (aOR 0.69, 95% CI, 0.64-0.74) were less likely to have PDC ≥80% with SGLT2is compared to those with low copayment. Conclusion: In a large cohort of individuals with diabetes and HF, 1-year adherence to GLP1RA or SGLT2i therapies was highest among individuals with low copayment. Improving adherence to guideline-based therapies requires interventions that reduce prescription costs.