PT - JOURNAL ARTICLE AU - Karen Luetsch AU - Debra Rowett AU - Michael J Twigg TI - A realist synthesis of pharmacist-conducted medication reviews in primary care after leaving hospital: what works for whom and why? AID - 10.1136/bmjqs-2020-011418 DP - 2021 May 01 TA - BMJ Quality & Safety PG - 418--430 VI - 30 IP - 5 4099 - http://qualitysafety.bmj.com/content/30/5/418.short 4100 - http://qualitysafety.bmj.com/content/30/5/418.full SO - BMJ Qual Saf2021 May 01; 30 AB - Background Medication reviews for people transitioning from one healthcare setting to another potentially improve health outcomes, although evidence for outcome benefits varies. It is unclear when and why medication reviews performed by pharmacists in primary care for people who return from hospital to the community lead to beneficial outcomes.Objective A realist synthesis was undertaken to develop a theory of what works, for whom, why and under which circumstances when pharmacists conduct medication reviews in primary care for people leaving hospital.Methods The realist synthesis was performed in accordance with Realist And MEta-narrative Evidence Syntheses: Evolving Standards reporting standards. An initial programme theory informed a systematic literature search of databases (PubMed, Embase, Cumulative Index of Nursing and Allied Health Literature, International Pharmaceutical Abstracts, OpenGrey, Trove), augmented by agency and government sources of information. Documents were synthesised by exploring interactions between contexts, intervention, outcomes and causal mechanisms.Results The synthesis identified 9 contexts in which 10 mechanisms can be activated to influence outcomes of pharmacist medication reviews conducted in primary care postdischarge. For a medication review to take place these include trust patients have in healthcare professionals, their healthcare priorities postdischarge, capacity to participate, perceptions of benefit and effort, and awareness required by all involved. For the medication review process, mechanisms which issue an invitation to collaborate between healthcare professionals, enable pharmacists employing clinical skills and taking responsibility for medication review outcomes were linked to more positive outcomes for patients.Conclusions Medication reviews after hospital discharge seem to work successfully when conducted according to patient preferences, programmes promote coordination and collaboration between healthcare professionals and establish trust, and pharmacists take responsibility for outcomes. Findings of this realist synthesis can inform postdischarge medication review service models.All data relevant to the study are included in the article or uploaded as supplementary information, further data related to searches and screening will be available from the submitting author on request.