Mapping the implementation of pharmacogenomic testing in community pharmacies 2003-2021 using the Theoretical Domains Framework: A scoping review.

Background: Pharmacogenetic (PGx) testing is an evidence-based approach to finding effective medication therapies. While community pharmacists are ideally situated to provide PGx testing, the extent of its implementation is limited within community pharmacies.

Objective: This study aimed to explore trends in the international peer-reviewed primary literature on community pharmacists' implementation of PGx and map the main findings on the Theoretical Domains Framework (TDF).

Methods: A literature search and 2-step screening were conducted per PRISMA Extension for Scoping Reviews. Inclusion criteria were English language, community pharmacy setting, full papers, and empirical research. Data were collated in a data extraction form. The main findings were deductively mapped on the TDF with a content analysis approach.

Results: Of 1176 identified documents screened, 39 were included in this scoping review. Four groups of research were identified: pre-implementation surveys (interviews, and focus groups [56%, n = 22]); PGx implementation (single cohort to assess feasibility [38%, n = 15]); PGx implementation (controlled study to assess feasibility [n = 1, 2.5%]); and efficacy of PGx (2.5%, n = 1). Most studies throughout the 4 groups sought pharmacists' perceptions (46%, n = 18) and used the quantitative paradigm (77%, n = 30). TDF mapping documented positive beliefs about the benefits of PGx testing as a part of the pharmacists' role. Barriers to PGx use included pharmacists' awareness of knowledge gaps, low confidence in interpreting and communicating PGx results, concerns about cost, privacy, and integration into pharmacy workflow.

Conclusion: Research addressing PGx implementation within the community pharmacy evolved from assessing individuals' perceptions of PGx to determining the feasibility of PGx testing in pharmacies and evaluating the impact of PGx testing on patient outcomes in depression. Mapping the main findings on the TDF facilitates the development of multidimensional interventions, potentially targeting patients, pharmacists, and health policy.