Estimated Effect of Pharmacist Prescriber Authority on PrEP Medication Fill Rate Index

The change in PrEP annual fill rate index due to pharmacist prescriber authority is estimated using an event study analysis of states that passed policies to allow pharmacists to prescribe PrEP, compared to states that did not. Event study estimates are obtained by regressing state-level PrEP annual fill rate index on lead and lag dummy variables (indicating how many years before or after the year the policy was passed), with state and year fixed effects to account for state-level differences and national time trends in PrEP use. This figure displays the event study coefficient estimates and their 95% confidence intervals (using robust standard errors clustered at the state level). These estimates reflect the local average treatment effect of pharmacist prescriber authority on the treated states' PrEP fill rate index in each year after the policy was passed. The treated states include: California, Colorado, Maine, Nevada, Oregon, and Virginia. PrEP annual fill rate index is calculated as total annual PrEP fills, divided by total annual fills for a fixed basket of prescription drugs.