Masahiro Akishita

Aim The purpose of the present study was to clarify the association of pneumonia admission with polypharmacy and specific drug use in community‐dwelling older people. Methods Using health insurance and long‐term care insurance data from Kure city in Japan, we retrospectively collected data for older community‐dwelling people (aged ≥65 years) from April 2017 to March 2019. The outcome was pneumonia admission. We carried out multivariate logistic regression analysis to identify the association of pneumonia admission with polypharmacy (≥5 drugs), the use of psychotropic drugs or anticholinergics with adjustment for patient backgrounds, such as comorbidity, and the daily life independence level for the older people with disability. Results Of 59 040 older people, 4017 (6.8%) participants were admitted for pneumonia in 2 years. The ratio of polypharmacy, and the use of psychotropic drugs and anticholinergics in the admission group were significantly higher than the non‐admission group. Multivariate logistic regression analysis showed that polypharmacy (odds ratio 1.29, 95% confidence interval 1.18–1.41), and the use of conventional antipsychotic drugs (odds ratio 1.39, 95% confidence interval 1.02–1.90), atypical antipsychotic drugs (odds ratio 1.67, 95% confidence interval 1.37–2.05) and anticholinergics (odds ratio 1.22, 95% confidence interval 1.13–1.33) were significantly associated with pneumonia admission. Conclusion The present results suggest that polypharmacy, and the use of psychotropic drugs and anticholinergics are risk factors for pneumonia admission. Geriatr Gerontol Int 2024; 24: 404–409 .