Process evaluation of implementation strategies to reduce potentially inappropriate medication prescribing in older population: A scoping review

•Implementation strategies to reduce PIM prescribing are studied widely.•Interest in implementation process is growing; all publications date from the 2010s.•Conceptualization of process evaluation in PIM prescribing is indeterminate.•Most process evaluations focus on the initial stages of the process.•Different implementation strategies seem to focus on different process outcomes.