A systematic review of general practice-based pharmacists' services to optimize medicines management in older people with multimorbidity and polypharmacy.

Background: Few studies have evaluated roles of general practice-based pharmacists (PBPs), particularly in optimizing medicines management for older people with both multimorbidity and polypharmacy.

Objective: To explore the types and effectiveness of services provided by PBPs, either alone or in collaboration with other primary health care professionals, that sought to optimize medicines management for older people with multimorbidity and polypharmacy.

Methods: Eight electronic databases and three trial registries were searched for studies published in English until April 2020. Inclusion criteria were randomized controlled trials, non-randomized controlled trials and controlled before-and-after studies of services delivered by PBPs in primary care/general practice, for patients aged ≥65 years with both multimorbidity and polypharmacy that focused on a number of outcomes. The Cochrane risk of bias tool for randomized trials (RoB 1) and the Risk of Bias in Non-randomized Studies-of Interventions (ROBINS-I) assessment tool were used for quality assessment. A narrative synthesis was conducted due to study heterogeneity.

Results: Seven studies met inclusion criteria. All included studies employed PBP-led medication review accompanied by recommendations agreed and implemented by general practitioners. Other patient-level and practice-level interventions were described in one study. The limited available evidence suggested that PBPs, in collaboration with other practice team members, had mixed effects on outcomes focused on optimizing medicines management for older people. Most included studies were of poor quality and data to estimate the risk of bias were often missing.

Conclusion: Future high-quality studies are needed to test the effects of PBP interventions on a well-defined range of medicines management-related outcomes.