The evidence of pharmacists' interventions in patients with chronic kidney disease is sparse, of variable quality and with heterogeneous outcomes. On the basis of best available evidence, pharmacists' interventions may have a positive impact on outcomes of patients with chronic kidney disease.

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Systematic reviews that assessed clinical pharmacy services targeting specific conditions were more conclusive given that the intervention was well defined, and the measured outcomes were unequivocal and tangible. Conversely, the results were inconclusive for interventions with a broader target and with monitoring parameters that were unclearly established or inconsistently assessed across studies. These findings emphasize the need to better define clinical pharmacy services and standardize methods that assess the impact of these services on patient health outcomes.

Background Clinical pharmacy services have potential to contribute significantly to the multidisciplinary team providing safe, effective and economic care for patients. Given recent practice developments (e.g. polypharmacy reviews and pharmacist prescribing) there is a need to provide a current synthesis of the evidence base for characteristics and outcomes of clinical pharmacy practice in chronic kidney disease patients. Aim of the review To critically appraise, synthesise and present the available evidence of the characteristics (structures and processes) and outcomes of clinical pharmacy practice as part of the multidisciplinary care of patients with chronic kidney disease. Method PubMed, International Pharmaceutical Abstracts (IPA), Cumulative Index to Nursing and Allied Health Literature (CINAHL), Medline and Scopus were searched for peer reviewed papers using improved search strategy. Included studies were quality assessed using Downs and Black tool for controlled studies and the mixed methods appraisal tool for all controlled and non-controlled studies. Data were extracted and synthesised using a narrative approach. Screening, quality assessment and data extraction were performed by two independent researchers. Ethics approval was not required. Results Forty-seven studies were identified from a variety of countries, with 31 based in a hospital setting. Controlled study designs were employed in 20, with only ten of these using randomisation. Resources available for service provision were poorly reported in all papers. Positive impact on clinical outcomes included significant improvement in parathyroid hormone, blood pressure, haemoglobin and creatinine clearance. Pharmacists identified 5302 drug related problems in 2933 patients and made 3160 recommendations with acceptance rates up to 95%. Impact on humanistic outcomes was shown through improvement in health related quality of life and patient satisfaction. Economic benefits arose from significant cost savings through pharmaceutical care provision. Conclusion While there is some evidence of positive impact on clinical, humanistic and economic outcomes, this evidence is generally of low quality and insufficient volume. While the existing evidence is in favour of pharmacists’ involvement in the multidisciplinary team providing care to patients with chronic kidney disease, more high-quality research is warranted. Electronic supplementary material The online version of this article (10.1007/s11096-019-00816-4) contains supplementary material, which is available to authorized users.

DEPICT 2 is a reliable tool to characterize components of clinical pharmacy services, which should be used to ensure consistent reporting of interventions to allow their reproducibility in practice.