Assessing variation among the national essential medicines lists of 21 high-income countries: a cross-sectional study.

Essential medicines lists of high-income countries are similar to each other, but significant variations in essential medicine list composition and specifically the number of medications included were noted. Effective medicines were left off several countries' lists, and globally recalled medicines were included on over half the lists. Comparing the essential medicines lists of countries within the same income status category can provide a useful subset of lists for policymakers and essential medicine list creators to use when creating or maintaining their lists.