Preliminary research Into barriers to quality use of warfarin in RACFs from the perspectivas of General Practitioners (GPs) and registered nurses Identified communication, monitoring, documentation and decision-support inadequacies in systems employed. High level evidence exists for warfarin in reducing thromboembolism. however there is a paucity of evidence in older. frail persons in RACFs, with comorbidities and complex medication regimes. Safe medication practices for warfarin in this setting are essential. From the preliminary research, a standardised warfarin-specific medication chart which could function as a prescription, monitoring. administration record and communication tool was inductively developed with multidisciplinary input.