Economic evaluations of therapeutic drug monitoring interventions in acute hospital‐based settings: A systematic review

Abstract Aims Therapeutic drug monitoring (TDM) aims to optimize drug therapy. As demand on health resources increases, and the technology underpinning TDM becomes more sophisticated, the economic benefits of TDM in hospitals is unclear. The aim of this systematic review was to summarize the economic evidence that could be used to support investment in TDM in hospital settings. In so doing, we sought to provide guidance for future economic evaluations. Methods Medline, Embase, CENTRAL, Econlit and NHS Economic Evaluation databases were searched (inception to December 2022) for economic evaluations of hospital‐based TDM. Two authors reviewed the studies and extracted data. Overall quality of economic analysis reporting was assessed using the Consolidated Health Economic Evaluation Reporting Standards (CHEERS) checklist. Results Ten prospective studies (including six randomized studies) and nine retrospective studies were eligible. Overall study reporting was poor, publications meeting a median (range) of 61% (46–82%) of CHEERS checklist criteria. An antimicrobial TDM intervention for adult patients was the focus of most studies ( n = 18). Variable clinical outcomes were reported, and length of stay was the primary economic outcome for most studies ( n = 13). The majority of studies determined that TDM was economically and clinically favourable ( n = 14), four studies reporting a cost‐reduction in patient sub‐populations. Conclusions Significant improvements in both economic and clinical outcomes may be realized with TDM interventions, particularly when targeted to complex patient populations. Attainment of therapeutic target could serve as a feasible surrogate measure of benefit for hospital‐based TDM interventions. However, systematic reporting of economic outcomes is needed to inform investment decisions.