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Polypharmacy and the risk of drug–drug interactions and potentially inappropriate medications in hospital psychiatry
Author(s) -
Wolff Jan,
Hefner Gudrun,
Normann Claus,
Kaier Klaus,
Binder Harald,
Hiemke Christoph,
Toto Sermin,
Domschke Katharina,
Marschollek Michael,
Klimke Ansgar
Publication year - 2021
Publication title -
pharmacoepidemiology and drug safety
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.023
H-Index - 96
eISSN - 1099-1557
pISSN - 1053-8569
DOI - 10.1002/pds.5310
Subject(s) - polypharmacy , medicine , drug , pharmacovigilance , medical prescription , pharmacoepidemiology , psychotropic drug , epidemiology , geriatrics , emergency medicine , psychiatry , intensive care medicine , pharmacology
Abstract Purpose The aim of this study was to analyze the epidemiology of polypharmacy in hospital psychiatry. Another aim was to investigate predictors of the number of drugs taken and the associated risks of drug–drug interactions and potentially inappropriate medications in the elderly. Methods Daily prescription data were obtained from a pharmacovigilance project sponsored by the Innovations Funds of the German Federal Joint Committee. Results The study included 47 071 inpatient hospital cases from eight different study centers. The mean number of different drugs during the entire stay was 6.1 (psychotropic drugs = 2.7; others = 3.4). The mean number of drugs per day was 3.8 (psychotropic drugs = 1.6; others = 2.2). One third of cases received at least five different drugs per day on average during their hospital stay (polypharmacy). Fifty‐one percent of patients received more than one psychotropic drug simultaneously. Hospital cases with polypharmacy were 18 years older ( p < 0.001), more likely to be female (52% vs. 40%, p < 0.001) and had more comorbidities (5 vs. 2, p < 0.001) than hospital cases without polypharmacy. The risks of drug–drug interactions (OR = 3.7; 95% CI = 3.5–3.9) and potentially inappropriate medication use in the elderly (OR = 2.2; CI = 1.9–2.5) substantially increased in patients that received polypharmacy. Conclusion Polypharmacy is frequent in clinical care. The number of used drugs is a proven risk factor of adverse drug reactions due to drug–drug interactions and potentially inappropriate medication use in the elderly. The potential interactions and the specific pharmacokinetics and ‐dynamics of older patients should always be considered when multiple drugs are used.