This series of studies examines the impact of formularies on prescription drug utilization and costs in five states (Arkansas, California, Indiana, Kentucky, and New York) that implemented formularies in 2018 and 2019. The studies also examine the effect on physician dispensing and generic utilization in states with applicable formulary rules.

These studies can help policymakers and other stakeholders understand the impact of implementing various types of drug formularies on prescriptions provided to workers with newer work-related injuries and on associated prescription drug costs in their state workers’ compensation systems. 

As the formulary in each state is distinct, readers are advised to take the differences in formulary design and regulations into account when making comparisons across reports examining the impact of the drug formularies in different states. In addition, prescription drug use and costs before the formulary, drug policies in the state, and other workers’ compensation policies that may interact with the enforcement of the formulary rules may also contribute to the differential impacts of the drug formularies.

Monitoring Trends after Adoption of Drug Formularies. Vennela Thumula and Te-Chun Liu. March 2023. WC-23-21 to WC-23-25.

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