Worldwide Prevalence of Polypharmacy: A Systematic Review

Introduction: The present study has compiled the prevalence of polypharmacy worldwide and assessed the prevalence of polypharmacy in different populations, including community-dwelling individuals, hospitalized patients, and institutionalized patients. Methods: This systematic review was conducted and reported according to the guidelines outlined in the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) statement. A systematic search of electronic databases, including PubMed, Web of Science, and Scielo, was performed in March 2021 without any date and language restrictions. Combinations of the following keywords were used for the search strategy: polypharmacy OR multiple medications OR multiple medicines OR multiple drug AND prevalence. Based on the search and inclusion criteria, two hundred and eight studies (73,076,167 individuals) were selected for inclusion in the systematic review. It was observed that there is a wide variation in the prevalence of polypharmacy between studies. Results: The prevalence of polypharmacy was found to be 30.2%, 61.7%, and 56.9% for community-dwelling individuals, hospitalized patients, and institutionalized patients, respectively. Conclusion: Based on the analyses, this systematic review has demonstrated a wide variation in the prevalence of polypharmacy between studies and countries and a high prevalence of polypharmacy in institutionalized and hospitalized patients.