This academic paper evaluates the impact of Oregon's improvement project to reduce the number of high dose opioid prescriptions. The study found that there was an immediate reduction in high dose opioid prescription rates but rates of opioid overdose did not decrease.
Hartung, D. M., Geddes, J., Hallvik, S. E., Korthuis, P. T., Middleton, L., Leichtling, G., Hildebran, C., & Kim, H. (2022). Evaluation of a Medicaid performance improvement project to reduce high-dose opioid prescriptions. BMC Health Services Research, 22(1). =