Impact of Potentially Inappropriate Medications on Kidney Function in Chronic Kidney Disease: Retrospective Cohort Study

INTRODUCTION: Chronic kidney disease (CKD) represents a major public health burden. Potential inappropriate medications (PIMs) are common in patients with CKD. However, its impact on kidney outcomes has not been adequately elucidated for middle-aged patients. This study aimed to clarify the prescription status of PIMs for middle-aged patients with CKD and its effect on kidney function decline. METHODS: Using an administrative claims database in Japan, a retrospective cohort study was conducted among Japanese patients with CKD (aged 20–74) who underwent annual health check-ups at least three times between April 2008 and December 2020. PIM exposure was defined as medications to be avoided in older adults as defined by the 2019 American Geriatrics Society Beers Criteria. The association between the number of prescribed PIMs and the decline in estimated glomerular filtration rate (eGFR) was examined using logistic regression models adjusted for clinical characteristics and laboratory variables. RESULTS: A total of 43,143 patients with CKD (mean age 57 years, median eGFR: 52 mL/min/1.73 m²) were analyzed, and approximately 40% of the patients were prescribed one or more PIMs. The most commonly prescribed PIMs were pain medications (18.5%), followed by gastrointestinal medications (9.8%), central nervous system medications (8.6%), and cardiovascular medications (8.6%). After adjustment, exposure to 2 or ≥3 PIMs was associated with an increased risk of 30% eGFR decline (adjusted odds ratio 1.71 [95% confidence interval, 1.24–2.37] and 1.65 [95% confidence interval, 1.08–2.52], respectively) as compared to the control group. CONCLUSION: This study showed that middle-aged patients with CKD who were prescribed ≥2 PIM had an increased risk of progression of CKD. Further studies are needed to analyze whether deprescribing steps contribute to reduce PIM prescriptions and prevent CKD progression.