Drug-related problems and changes in drug utilization after medication reviews in nursing homes in Oslo, Norway

OBJECTIVE We describe the drug-related problems (DRPs) identified during medication reviews (MRs) and the changes in drug utilization after MRs at nursing homes in Oslo, Norway. We explored predictors for the observed changes. DESIGN Observational before-after study. SETTING Forty-one nursing homes. INTERVENTION MRs performed by multidisciplinary teams during November 2011 to February 2014. SUBJECTS In all, 2465 long-term care patients. MAIN OUTCOME MEASURES DRPs identified by explicit criteria (STOPP/START and NORGEP) and drug-drug interaction database; interventions to resolve DRPs; drug use changes after MR. RESULTS A total of 6158 DRPs were identified, an average of 2.6 DRPs/patient, 2.0 for regular and 0.6 for pro re nata (prn) drugs. Of these patients, 17.3% had no DRPs. The remaining 82.7% of the patients had on average 3.0 DRPs/patient. Use of unnecessary drugs (43.5%), excess dosing (12.5%) and lack of monitoring of the drug use (11%) were the most frequent DRPs. Opioids and psychotropic drugs were involved in 34.4% of all DRPs. The mean number of drugs decreased after the MR from 6.8 to 6.3 for regular drugs and from 3.0 to 2.6 for prn drugs. Patients with DRPs experienced a decrease of 1.1 drugs after MR (0.5 for regular and 0.6 for prn drugs). The reduction was most pronounced for the regular use of antipsychotics, antidepressants, hypnotics/sedatives, diuretics, antithrombotic agents, antacid drugs; and for prn use of anxiolytics, opioids, hypnotics/sedatives, metoclopramide and NSAIDs. CONCLUSION The medication review resulted in less drug use, especially opioids and psychotropic drugs.