Targeting Treatment-Resistant OUD With Ketamine-Assisted Mindfulness Oriented Recovery Enhancement

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• English-speaking
• DSM-5 criteria for Opioid Use Disorder (OUD)
• Documented evidence (by urine toxicology) of current illicit drug use (upon screening) or by self-report on the Addiction Severity Index (ASI)
• Men/Women >/= 18
• Current prescription of a buprenorphine-containing product
• Have a support person that would be able to escort the subject home on the evening of the ketamine dosing session. The use of ride services will not be permitted (e.g., Uber, Lift, taxi, etc.)
• Agreement to adhere to Lifestyle Considerations

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• 1. A primary DSM-5 Axis I diagnosis of schizophrenia, schizoaffective disorder, dissociative identity disorder, or bipolar I/II disorder as determined by psychiatric evaluation; Has baseline hypertension (≥160 SBP or ≥100 DBP), after repeated measurements. Note: Participants with hypertension that has been controlled by medication down to <160 Systolic blood pressure (SBP) and <100 diastolic blood pressure (DBP) will be allowed participate; Has baseline abnormal resting heart rate (>100 or <60). 4. History of cardiovascular disease, including but not limited to clinically significant coronary artery disease, cardiac hypertrophy, cardiac ischemia, congestive heart failure, myocardial infarction, angina pectoris, coronary artery bypass graft or artificial heart valve, stroke, transient ischemic attack, or any clinically significant arrhythmia; Has QTcf >450msec for men or women on EKG. Note: Participants may qualify for the study if QTc 450-480 msec on one EKG, but then <=450 msec on repeat EKG. If QT-prolonging medications are started or increased in dose after enrollment and prior to ketamine administration, a repeat EKG must be done >12-hours after this change in order to assure continued safe enrollment in the trial; Active suicidal intent or suicidal or non-suicidal self-injurious behaviors, as defined by a "yes" response to question 4 on C-SSRS within the past 6 months at screening or prior to dosing (Active Suicidal Ideation with Some Intent to Act, with or without Specific Plan); Suicidal behaviors within the last 6 month. 8. History of allergy or hypersensitivity reaction to ketamine. 9. History of ketamine use disorder. 10. History of intracranial bleeding or stroke. 11. Current intracranial mass. 12. Seizure within the last 6 months prior to screening visit. 13. Baseline oxygen saturation <95%. 14. Current significant liver disease. 15. Meets the following laboratory parameters:; Any significant liver diseases or symptoms of liver disease regardless of liver enzyme levels; Asymptomatic alanine aminotransferase (ALT) or aspartate aminotransferase (AST) >=5x upper limit of normal (ULN); Symptomatic ALT or AST >= 2x ULN; AST/ALT >3 upper limit of normal (ULN); Total bilirubin > 1.5x ULN (Gilbert syndrome is allowed); Alkaline phosphatase (ALP) >2x ULN; Renal insufficiency (i.e., estimated glomerular filtration rate (eGFR) < 30 milliliter/minute (mL/min) /1.73 m\^2 (using the 2021 Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) Creatinine Equation), Creatinine Clearance (CrCl) < 30 mL/min (using the Cockcroft-Gault Equation), or current dialysis)); Currently pregnant or breastfeeding. 17. Has uncontrolled insulin-dependent diabetes and has had a hospitalization for diabetes-related complication within 6 months of signing ICF; Diagnosed cognitive impairments, including dementia, mild cognitive impairment, traumatic brain injury, or developmental delays, that would prevent the participant from completing the study protocol, as identified by self-disclosure when asked in eligibility screening question; Individuals prescribed monoamine oxidase inhibitors.(see Appendix 1) 20. Individuals prescribed medications that are CYP2B6 inhibitors or inducers (see Appendix 1) 21. Patients taking >2 mg of lorazepam-equivalents per day