Rates of opioid agonist treatment prescribing in provincial prisons in Ontario, Canada, 2015-2018: a repeated cross-sectional analysis.

The increase in opioid agonist treatment prescribing between 2015 and 2018 in provincial prisons shows that efforts to scale up access to treatment in the context of the opioid overdose crisis have included people who experience incarceration in Ontario. Further work is needed to understand unmet need for treatment and treatment impacts.