Chronic polypharmacy at all age: A population-based drug utilization study

Polypharmacy is a growing concern often described only in older people by cumulating all drugs taken. We aimed to describe chronic polypharmacy in France, regardless of age. A cross-sectional descriptive study was performed using the 1/97th representative sample of the French health insurance nationwide database (EGB). All subjects alive on January 1, 2015, and covered by the French healthcare insurance were included, and their information collected until December 31, 2015, or date of death. Drug exposures were estimated from drug dispensing dates and treatment durations. Chronic uses of drug were defined as drugs used daily for more than 6 months. Chronic polypharmacy corresponded to the exposure to five chronic uses of drug or more. In 2015, information of 584 862 subjects was collected (mean age: 42.2 years). Prevalence of chronic polypharmacy was 5.6% and incidence 1.1%. Prevalence of chronic polypharmacy increased noticeably from 0.2% for subjects aged 18 to 40 years to a maximum of 29.2% for subjects aged 80 to 90 years and then decreased to 23.6% for subjects aged 90 years and more. Lipid-modifying agents were the most frequent drugs involved in chronic polypharmacy (10% of exposure). According to age, the most important differences between the younger and older people were found for cardiovascular drugs (43.5% vs. 45.7% of exposure, respectively) and nervous system drugs (13.7% vs. 11.5% of exposure, respectively). This population-based study showed increasing of chronic polypharmacy and evolution of chronic drug patterns with age.