Mindful MAT Adherence: Mindfulness-Based Relapse Prevention (MBRP) to Improve Extended-release Naltrexone (XR-NTX) Adherence and Drug-use Outcomes for Opioid Use Disorder (OUD)

Medically detoxified OUD patients enrolling into a 60-day residential program will be randomized to either MAT Treatment-As-Usual (TAU; n=100) or TAU+MBRP (MBRP; n=100) as part of their residential treatment and followed for 3-months post-discharge to assess MAT adherence and drug-use. All participants (n=200) will participate in residential TAU (i.e., MAT, supportive group therapy), will be scheduled monthly MAT appointments per discharge treatment procedures, and will complete assessments at baseline, post- treatment, and 1-, 2-, and 3-month follow-ups. Study Aims include:

AIM 1 (PRIMARY): Compare impact of TAU versus TAU+MBRP on medication adherence and drug-use outcomes. Hypotheses: Relative to TAU, TAU+MBRP participants will demonstrate a) greater MAT adherence measured at follow-up timepoints, and b) reduced drug-use (i.e., self-report, urine drug-screens [UDS]) measured at discharge and follow-up timepoints. AIM 2: Determine whether the beneficial effects of TAU+MBRP on outcome are mediated by improvements in opioid craving and dispositional mindfulness. Hypotheses: TAU+MBRP participants will report greater improvements in distress tolerance and mindfulness, relative to TAU, which will mediate treatment outcomes (i.e., MAT adherence, reduced drug use and positive-UDS). EXPLORATORY AIM 3: Determine effects of baseline factors on treatment outcomes. Hypotheses: More severe trauma exposure (i.e., increased number of traumas) and greater posttraumatic stress symptom severity will result in poorer treatment adherence (i.e., reduced MAT follow-up appointments) and worse drug-use outcomes (i.e., increased self-reported drug use, positive-urine drug-screens) throughout each the follow-up assessments among TAU participants but not among MBRP participants.

Study Design Overview: In an randomized controlled trial design, patients enrolling into a residential addiction treatment center will be randomized to TAU (i.e., MAT, supportive group therapy) or TAU+MBRP with comparisons being made between MBRP (n=100) and treatment-as-usual (TAU; n=100) on assessment measures collected at baseline, prior to residential discharge, and at 1, 2, and 3-month follow-up time points. To address AIM 1 (TAU+MBRP, Adherence and Drug-Use): participants will be randomly assigned to receive TAU or MBRP+TAU, during their residence within an inpatient treatment setting and will complete assessments at enrollment, prior to discharge, and at 1, 2, and 3-months follow-up to assess MAT adherence and drug-use. Comparisons, on assessment measures collected at follow-up, will be made between treatment conditions to determine if MBRP+TAU results in greater number MAT adherence, fewer positive UDS, reduced drug-craving, and increased mindfulness. AIM 2 (MBRP Mechanisms of Change): Will determine whether the beneficial effects of MBRP on treatment outcome (i.e., MAT adherence, drug-use) are mediated by increases in mindfulness and distress tolerance. AIM 3 (Predictors of MAT Adherence): will examine the extent to which prior trauma-exposure and PTSD symptom severity moderates MAT adherence and drug-use outcomes, among TAU participants (but not MBRP participants), following discharge from residential treatment.