Community pharmacy transformation under universal health coverage: Implementation barriers, cultural determinants, and cross-national lessons from Japan's ongoing transition – A narrative review

Background Community pharmacies worldwide are shifting from product-centered dispensing toward patient-centered clinical services. Japan achieved a prescribing–dispensing separation rate exceeding 80%, yet faces persistent challenges in delivering patient-centered services. This review examines why Japan's transformation has progressed slowly despite favorable structural conditions, and what lessons it offers other universal health coverage (UHC) systems. Methods We conducted a narrative review using PubMed/MEDLINE and Ichushi-Web, covering literature primarily from 2016 to 2026. Six targeted searches addressed Japan's context, three tiers of comparator countries, and implementation science frameworks. From 2388 unique records, 87 publications were included. The updated Consolidated Framework for Implementation Research (CFIR 2.0) served as the analytical framework. Results Tier 1 countries demonstrated that successful transformation requires aligned policy incentives, expanded scopes of practice, and robust outcome evidence. Tier 2 countries revealed shared cultural barriers, including physician-dominant hierarchies and dispensing-centered patient expectations. Japan's barriers spanned all five CFIR 2.0 domains: misaligned reimbursement, workforce shortages and absent pharmacy technicians, low pharmacist assertiveness, high service complexity, and fragmented implementation. Cultural factors—particularly high uncertainty avoidance and collectivism—interacted with institutional structures. Japan's family pharmacist system was associated with emerging evidence of benefit, including approximately 9% lower mortality risk, but limited adoption. Conclusions Structural separation alone is insufficient without concurrent investment in workforce capability, practice authority, payment reform, and cultural adaptation. CFIR 2.0 effectively captures the multi-level nature of implementation barriers, supporting performance-based remuneration, scope expansion, and culturally sensitive strategies.