Evolution of polypharmacy in a spanish population (2005-2015): A database study.

PURPOSE: To analyze the evolution of the prevalence of polypharmacy and excessive polypharmacy in a Spanish population, and to improve the identification of patients with polypharmacy. METHODS: A descriptive, annual cross-sectional observational study was carried out. PATIENTS: individuals over 14 years of age included in a multiregional primary care database of the Spanish population (BIFAP). ANALYSIS: prescription data. Period 2005-2015. VARIABLES: proportion of patients with polypharmacy (simultaneous prescription of ≥5 drugs) and excessive polypharmacy (≥10 drugs) for at least 6 months, according to sex and age groups. A trend analysis of the studied period was performed (overall, and by sex and age groups). RESULTS: The data are reported on a comparative basis (2005 vs 2015). Number of patients analyzed: 2664743 vs 4 002 877. The prevalence of polypharmacy increased significantly (2.5% vs 8.9%, P-value for trend <0.001), being greater in females throughout the study period and in the group aged ≥80 years (P-value for trends <0.001). The prevalence of excessive polypharmacy also increased significantly (0.1% vs 1%, P-value for trend <0.001), being higher in the group aged ≥80 years (P-value for trend <0.001). The proportion of patients with no chronic treatment decreased (80.2% vs 63.1%). CONCLUSIONS: The prevalence of polypharmacy in this Spanish population has tripled in the period 2005-2015, while excessive polypharmacy has increased 10-fold. These increments are seen in both sexes and in all age groups, particularly in individuals over 80 years of age. The proportion of patients without chronic treatments has decreased.