Trends in Out-of-Pocket Costs for Naloxone by Drug Brand and Payer in the US, 2010-2018

This observational study of 719 612 pharmacy claims data shows that OOP costs of naloxone grew substantially beginning in 2016. However, OOP costs did not increase for all patients and all brands of naloxone but primarily for uninsured patients and for the Evzio brand. The findings suggest that the OOP cost of naloxone has been an increasingly substantial barrier to naloxone access for uninsured patients, a population that constitutes nearly one-fifth of adults with opioid use disorder.