• İpek Bakimli and Emel Tuğrul.
• Manisa Merkezefendi State Hospital, Anesthesia Intensive Care Unit - Manisa, Turkey.
• Rev Assoc Med Bras (1992). 2024 Jan 1; 70 (1): e20230692e20230692.

ObjectiveThe aim of this study was to examine older individuals' rational drug use behavior, their knowledge of rational drug use, and the factors affecting it.MethodsThis study was conducted cross-sectionally with 440 patients aged 65 years who received inpatient treatment in internal medicine and surgery clinics between October 2021 and November 2022 using a Rational Drug Use Scale and rational drug use behavior questions.ResultsThe findings showed that the mean age of older adults was 72.56±5.84 years, and 51.8% were men. It was determined that 79.1% of the older adults did not check their expiration date before using the medicines, and 85.9% of them retained the remaining medicines after treatment. Results indicated that 77.3% of older adults knew less about rational drug use. Additionally, a significant difference was observed between older adults' marital status, educational status, possession of outdated drugs at home, self-use of antibiotics without examination, and mean score on the Rational Drug Use Scale (p<0.05).ConclusionThe results showed that the rational drug use knowledge level of older adults was low and that there were differences in the knowledge levels of rational drug use according to certain behaviors and factors.

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