Impact of Policy Interventions on Oxycodone Prescribing in Queensland, Australia: An Uncontrolled Interrupted Time Series Study

Introduction Opioid prescribing rates are continuing to increase in Australia in line with prescribing rates seen internationally. Prescribing limits are one policy strategy to reduce short-term opioid prescribing, but there is limited evidence of their impact. Objective The aim of this study was to assess the impact of state and national policy interventions on changes to oxycodone 5 mg discharge prescriptions in public hospitals using electronic prescribing in Queensland, Australia by evaluating the proportion of oxycodone 5 mg discharge prescriptions written for ≤ 10 tablets across the study period. Method This research utilised a retrospective uncontrolled interrupted time-series design and was undertaken at 12 public hospitals using electronic prescribing from December 2018 to February 2021. The study analysed the impact of two sequential policy interventions that limited the recommended quantity of oxycodone 5 mg on discharge for all hospitalised patients. The first state-wide policy came into effect on 19 September 2019 and the second national policy came into effect on 1 June 2020. Results Over the 27-month period, there were 110,728 discharge prescriptions written in the 12 Queensland hospitals for oxycodone 5 mg. During the baseline period, approximately 50.7% (95% CI 49.5–51.8) of all oxycodone 5 mg prescriptions were from tablet quantities of ≤ 10 tablets. After the implementation of the state-wide policy, the proportion increased by 9% (95% CI 7.4–10.7; p = 0.001). The implementation of the national policy increased the proportion of oxycodone 5 mg prescriptions written for ≤10 tablets by 9.8% (95% CI 8.1–11.5; p