Schematic of the IMPP study: A pragmatic, open-label, two-arm, parallel cluster-randomised trial was conducted in UK general practices providing National Health Service primary medical care. Practices were required to use the EMIS electronic health records system and have more than 4000 registered patients. For inclusion in the study, participants were required to be aged 18 years or older, prescribed at least five regular medications (ie, medicines recorded in the clinical system as repeat prescriptions, and thus available for recurrent ordering by patients without having to see a clinician) irrespective of when the drug was last issued, and with at least one indicator of potentially inappropriate prescribing identified by an informatics tool. Practices were randomly allocated to deliver the polypharmacy intervention or continue usual care. The complex intervention comprised a structured, collaborative, and patient-centred approach to medication review, supported by informatics, clinician training, performance feedback, and financial incentivisation. In each practice, adults receiving five or more regular medications, with at least one indicator of potentially inappropriate prescribing, were reviewed over a 6-month period. The primary outcome was number of indicators of potentially inappropriate prescribing at 26 weeks’ follow-up, analysed on an intention-to-treat basis.
Simon reflects on the fact that IMPP was a study that felt very embedded in real world practice - a way of understanding a service already delivered by clinical pharmacists in GP surgeries but in a more structured way. #SWPRN25