Risk of Drug-Induced Accidents and Injuries in Elderly Patients Treated with Specific Drugs Rather than Polypharmacy : Analyses of the Japanese Adverse Drug Event Report Database

  • HAGA Tomohiro
    Clinical Research Support Center, the University of Tokyo Hospital Department of Healthcare and Regulatory Sciences, Division of Pharmaceutical Regulatory Pharmacy, Showa University School of Pharmacy
  • TAKI-TAKEMOTO Iori
    Department of Healthcare and Regulatory Sciences, Division of Pharmaceutical Regulatory Pharmacy, Showa University School of Pharmacy
  • MURASE Remi
    Department of Healthcare and Regulatory Sciences, Division of Pharmaceutical Regulatory Pharmacy, Showa University School of Pharmacy
  • KAMEI Daisuke
    Department of Healthcare and Regulatory Sciences, Division of Pharmaceutical Regulatory Pharmacy, Showa University School of Pharmacy
  • IWAI Shinichi
    Department of Healthcare and Regulatory Sciences, Division of Pharmaceutical Regulatory Pharmacy, Showa University School of Pharmacy

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One of the reasons the health care system requires long-term nursing care for elderly patients is the risk of falls and fractures. In this study, we sought to identify risk factors for drug-induced falls and fractures in elderly patients in Japan. Risk factors for drug-induced falls and fractures in the elderly were analyzed by searching for the Standardised Medical Dictionary for Regulatory Activities (MedDRA) query (SMQ) “accidents/injuries” in the Japanese Adverse Drug Event Report database (JADER), as this SMQ was the most well suited for evaluating data on falls and fractures. For elderly patients in Japan, the risk factors for drug-induced accidents/injuries include age ≥ 70 years old, female sex, and treatment with specific drugs, but not polypharmacy. Among the risk factors with the 10 highest reporting odds ratios (RORs) were treatment with: anti-osteoporosis agents such as bisphosphonates (e.g., minodronic acid), eldecalcitol and bazedoxifene; dementia therapeutic agents such as rivastigmine and memantine; antiparkinsonian agents such as entacapone and pramipexole; and neuropathic pain relievers such as pregabalin. Although various geriatric syndromes were generally caused by polypharmacy, it has been posited that individual medications such as those mentioned above have a more significant association with drug-induced accidents and injuries in the elderly than polypharmacy. These drugs should be used cautiously while considering drug interruption, dose reductions, and switching to alternative therapies with lower risks. An association between accidents/injuries and drugs targeting the central nervous system (such as hypnotics, sedatives, anxiolytics, and antidepressants) has previously been reported. However, in the present study, no elevated risks in association with triazolam, zopiclone, flunitrazepam, diazepam, rilmazafone, estazolam, etizolam, or paroxetine were detected. Using RORs for risk detection for drugs in the JADER database is accessible and useful, and enables sensitive risk detection.

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