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Aims: The purpose of this study is to assess the persistence of Canadians with Type 2 diabetes mellitus (T2D) on loose-dose combination treatment (i.e., administered by separate devices) with a glucagon-like peptide 1 receptor agonist (GLP-1 RA) and basal insulin over 12 months.Methods: This study is a retrospective cohort study of T2D adults using a Canadian longitudinal prescription database over a 5-year period. Cohort 1 (n = 12,411) is a primary cohort including only individuals inexperienced with the combination therapy at index. Cohort 2 (n = 13,498) is an exploratory cohort and includes everyone regardless of previous experience on the loose-dose combination therapy. The primary endpoint is the proportion of individuals persistent and average days persistent to the loose-dose combination therapy at 12 months in Canada.Results: In Cohort 1, overall persistence was 47% in the 12-month period post-index. Persistence is similar when including all inexperienced and subsequent loose-dose combination experiences in Cohort 2 (45%).Conclusions: Canadian T2D adults taking a loose-dose combination therapy of a GLP-1 RA and basal insulin had overall low persistence and lower than reports from previous studies of GLP-1 RA or basal insulin alone. Improving persistence to combination therapy with GLP-1 RA plus basal insulin is an important issue to explore in clinical practice. [ABSTRACT FROM AUTHOR]