Background: Pharmacists' provision of naloxone services in community pharmacy settings is well-recognized. Recently, studies describing pharmacists' naloxone services in settings other than community pharmacies have emerged in the literature. There is a need to synthesize evidence from these studies to evaluate the scope and impact of pharmacists' naloxone services beyond community pharmacy settings.

Objectives: The objectives of this systematic review were to a) identify pharmacists' naloxone services and their outcomes, and b) examine knowledge, attitudes, and barriers (KAB) related to naloxone service provision in non-community pharmacy settings.

Methods: Eligible studies were identified using PubMed, Web of Science, and CINAHL. Inclusion criteria were as follows: peer-reviewed empirical research conducted in the U.S. from January 2010 through February 2022; published in English; and addressed a) pharmacists' naloxone services and/or b) KAB related to the implementation of naloxone services. PRISMA guidelines were used to report this study.

Results: Seventy-six studies were identified. The majority were non-randomized and observational; only two used a randomized controlled (RCT) design. Most studies were conducted in veterans affairs (30%) and academic medical centers (21%). Sample sizes ranged from n = 10 to 217,469, and the majority reported sample sizes <100. Pharmacists' naloxone services involved clinical staff education, utilization of screening tools to identify at-risk patients, naloxone prescribing and overdose education and naloxone dispensing (OEND). Outcomes of implementing naloxone services included improved naloxone knowledge, positive attitudes, increased OEND, and overdose reversals. Pharmacists cited inadequate training, time constraints, reimbursement issues, and stigma as barriers that hindered naloxone service implementation.

Conclusion: This systematic review found robust evidence regarding pharmacist-based naloxone services beyond community pharmacy settings. Future programs should use targeted approaches to help pharmacists overcome barriers and enhance naloxone services. Additional research is needed to evaluate pharmacist naloxone services by using rigorous methodologies (e.g., larger sample sizes, RCT designs).