5-Day Injectable Extended-release Buprenorphine Initiation in Non-opioid-tolerant Individuals in a Carceral Setting: A Case Series.

Background: Injectable extended-release buprenorphine (XR-Bup) addresses several barriers to the implementation of treatment with medications for opioid use disorder (MOUD) in carceral settings due to lower risk of diversion and reduced operational procedures. However, there is no standardized approach or guideline for initiating sublingual buprenorphine (SL-Bup) and transitioning to XR-Bup in persons with opioid use disorder (OUD) who are not actively using opioids, a clinical scenario commonly encountered in carceral settings.

Methods: We conducted a retrospective case series of non-opioid-tolerant men with OUD at a Montana Department of Corrections facility who initiated XR-Bup using a 5-day induction protocol between May 1, 2023, and November 1, 2023. Primary outcome was receipt of the initial XR-Bup injection. Secondary outcomes were toleration of SL-Bup induction protocol and active continuation of XR-Bup at time of discharge.

Results: Sixteen individuals initiated the SL-Bup induction protocol, and all were successfully transitioned to XR-Bup with no severe adverse effects. There were no required dose changes or severe adverse effects from SL-Bup induction. Two (12%) elected to discontinue XR-Bup due to commonly reported adverse effects. Fourteen (88%) remained on XR-Bup at discharge.

Conclusions: Five-day induction of SL-Bup and transition to XR-Bup may be considered for non-opioid-tolerant individuals with OUD in carceral settings.