IntroductionSTOPP/START criteria for potentially inappropriate medications (PIMs, STOPP) and potential prescribing omissions (PPOs, START) have gained considerable interest and traction since they were first published in 2008. This review focuses on their uptake and impact in various clinical settings.Areas coveredSTOPP/START criteria, now in their third iteration, are explicit criteria designed to facilitate detection of common and clinically important PIMs and PPOs during routine medication review in any clinical setting. We examine the influence of the criteria, particularly in clinical trials that focused on their impact on clinically relevant endpoints.Expert opinionSTOPP/START criteria are widely used in several countries within Europe and beyond for medication review and audit. As a discreet intervention, the criteria have been tested in several single-center and two large-scale multi-center clinical trials. The single-center trials indicate that STOPP/START criteria reduce polypharmacy, inappropriate prescribing, ADRs (adverse drug reactions), medication cost and falls. In contrast, the SENATOR and OPERAM multicentre trials did not demonstrate significant reduction in ADRs, all-cause mortality, drug-related hospital readmissions, nor any improvement in quality-of-life. Further clinical trials are required to examine whether STOPP/START criteria as an intervention can deliver significant clinical benefit in a reproducible manner in various clinical settings.