Statin (mis)use in older people: A cross-sectional study using French health insurance databases.

Purpose: To describe the occurrence of potential statin misuse, its characteristics and associated factors in older people.

Methods: A retrospective cross-sectional study was conducted in Alsace and Lorraine (France) using French health insurance databases. Study population comprised community-dwelling patients and nursing homes residents aged 80 and over, who received at least one statin prescription between January 1, 2017 to April 30, 2017 (N = 38 268). Potential statin misuse was identified considering off-label uses, high-intensity doses, drug contraindications and statin-drug interactions.

Results: At least one potential statin misuse was detected for 19 468 patients (50.9%). Off-label prescription was the most frequent misuse observed (53.6%), followed by high-intensity statin dose (30.5%). Polypharmacy (five to nine drugs) and excessive polypharmacy (10 or more drugs) were the main risk factors associated with potential statin misuse (adjusted OR = 2.6 and 4.7 respectively). Nursing home, multi-morbidity and the presence of multiple prescriptions from different doctors for the same patient were other risk factors significantly associated. Two sensitivity analyzes (reconsiderations of off-label and high statin dose definitions) revealed the same statistical trend.

Conclusion: Potential statin misuse is frequent in people aged 80 and over. These findings should serve as a warning to health care professionals and hopefully will contribute to ensure an appropriate and safe use of statin in aged population.