BackgroundCare home residents often experience polypharmacy (defined as taking five or more regular medicines). Therefore, we need to ensure that residents only take the medications that are appropriate or provide value (also known as medicines optimisation). To achieve this, deprescribing, or the reduction or stopping of prescription medicines that may no longer be providing benefit, can help manage polypharmacy and improve outcomes. Various tools, guides, and approaches have been developed to help support health professionals to deprescribe in regular practice. Little evaluation of these tools has been conducted and no work has been done in the care home setting. ObjectiveThis qualitative study aimed to assess distinct types of deprescribing tools for acceptability, feasibility, and suitability for the care home setting. MethodsCognitive (think-aloud) interviews with care home staff in England were conducted (from December 2021 to June 2022) to assess five different deprescribing tools. The tools included a general deprescribing guidance, a generic (non-drug specific) deprescribing framework, a drug-specific deprescribing guideline/guide, a tool for identifying potentially inappropriate medications, and an electronic clinical decision support tool. Participants were recruited via their participation in another deprescribing study. The Consolidated Framework for Implementation Research informed the data collection and analysis. ResultsEight care home staff from 7 different care homes were interviewed. The five deprescribing tools were reviewed and assessed as not acceptable, feasible, or suitable for the care home setting. All would require significant modifications for use in the care home setting (e.g., language, design, and its function or use with different stakeholders). ConclusionsAs none of the tools were deemed acceptable, feasible, and suitable, future work is warranted to develop and tailor deprescribing tools for the care home setting, considering its specific context and users. Deprescribing implemented safely and successfully in care homes can benefit residents and the wider health economy.