The effect of the implementation of a good medical practice booklet on nursing home residents’ drug prescriptions: a difference-in-differences analysis based on data from electronic pill dispensers (Preprint)

BACKGROUND The elderly are particularly exposed to adverse events from medication. Among the various strategies to reduce polypharmacy, educational approaches have shown promising results. OBJECTIVE We aimed to evaluate the impact of the implementation of a good medical practice booklet on polypharmacy in nursing homes. METHODS We identified nursing homes belonging to a geriatric care provider that had launched a policy of proper medication use using a good medical practice booklet delivered to prescribers and pharmacists. Data were derived from electronic pill dispensers. The effect of the intervention on polypharmacy was assessed with multilevel regression models, with a control group to account for natural trends over time. The main outcomes were the average daily number of times when medication was administered and the number of drugs with different presentation identifier codes per resident per month. RESULTS 96,216 residents from 519 nursing homes were included between 1 January 2011 and 31 December 2014. The intervention group and the control group both decreased their average daily use of medication (-0.05 and -0.06). The good medical practice booklet did not have a statistically significant effect (exponentiated difference-in-differences coefficient 1.00, 95% confidence interval 0.99-1.02, P=.45). CONCLUSIONS Although the good medical practice booklet itself did not seem effective in decreasing medication use, our data show the effectiveness of a higher-level policy to decrease polypharmacy.