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IBO-CARE
A Phase 1/2a Three-Cohort Study of Ibogaine Versus Extended-Release Naltrexone With 12-Month Recovery Support in Opioid Use Disorder: A Randomised Double-Dummy Comparison and a Recent-Use Cohort
Sponsor study identifier
interventional
60
1 country
1
Study Start
July 1, 2027
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
Primary Completion
January 31, 2029
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
Study Completion
December 31, 2029
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
IBO-CARE is a single-site Phase 1/2a study evaluating the safety, tolerability, feasibility and preliminary outcomes of medically supervised ibogaine with 12 months of recovery support in adults with moderate-to-severe opioid use disorder. Up to 120 candidates will be screened to enrol 60 adults aged 18-65 into three cohorts of 20. Participants meeting the shared opioid-free and negative naloxone-challenge criteria will be randomised 1:1 to Cohort A or Cohort C. Cohort A receives extended-release naltrexone 380 mg intramuscularly and matching oral placebo. Cohort C receives oral ibogaine hydrochloride and matching intramuscular placebo. Cohort B follows a separate, nonrandomised recent-use ibogaine pathway with matching intramuscular placebo and clinically supervised stabilisation. All cohorts attend three monitored oral-treatment admissions at Months 0, 1 and 2. Repeat ibogaine administrations require individual eligibility and safety release. The planned injection schedule comprises twelve calendar-monthly administrations at Months 0-11, with final follow-up at Month 12. All participants receive equivalent preparation, psychological support, continuing addiction care, monthly clinical review and SENTINEL digital recovery support with a Garmin Venu 4. The acute monitoring model includes continuous telemetry during a 72-hour post-dose window, serial 12-lead ECGs, laboratory monitoring, emergency capability and independent safety oversight. Monitoring is extended when clinically required. Wearable information does not replace clinical cardiac monitoring. SENTINEL combines participant reports, wearable trends and scheduled assessments, with high-risk findings reviewed by qualified clinicians. Cohorts A and C use a double-blind, double-dummy comparison. Cohort B is open to the treating team, with masked outcome assessment where feasible. Treatment guesses are collected because the acute effects of ibogaine may reveal allocation. The study estimates preliminary effects and is not designed to establish confirmatory efficacy. The IND application has not yet been filed. The study remains not yet recruiting. ClinicalTrials.gov registration and assignment of an NCT number do not authorise study conduct. Enrolment and investigational treatment will begin only after the IND is in effect, IRB approval is in place, and all applicable DEA, Colorado, investigational-product, clinical-site and digital-system requirements have been satisfied. The registration will be updated when the actual FDA filing details are available.
Registry-reported information. Elapsed time and enrollment totals alone do not measure study progress or recruitment pace.
December 31, 2029
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
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Dates and qualifiers reported by the registry. Estimated dates do not confirm that a milestone has occurred.
September 19, 2026
Actual (reported)October 13, 2026
Actual (reported)July 1, 2027
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
January 31, 2029
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
December 31, 2029
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
Participants With One or More Treatment-Emergent Serious Adverse Events or Prespecified Adverse Events of Special Interest
Number of participants who experience at least one treatment-emergent serious adverse event or prespecified adverse event of special interest. Prespecified events include death, cardiac arrest, torsade de pointes, ventricular tachycardia or ventricular fibrillation, protocol-defined clinically significant QTcF prolongation, syncope, seizure, aspiration, intensive-care transfer, severe agitation, mania, psychosis, suicide attempt, precipitated withdrawal meeting serious-adverse-event criteria, or overdose. Each participant will be counted once regardless of the number of qualifying events.
From first assigned study intervention through 7 days after the third monitored admission, or 7 days after the last actual admission if the treatment course ends early.
Maximum Change From the Corresponding Pre-Dose Baseline in Fridericia-Corrected QT Interval
For each monitored admission, change in the Fridericia-corrected QT interval (QTcF) is calculated in milliseconds as each post-dose 12-lead ECG value minus the protocol-defined averaged pre-dose 12-lead ECG baseline for that admission. The outcome is the largest observed QTcF change for each participant across the three admissions. ECGs undergo clinical interpretation. This measure reports QTcF change only; threshold crossings and ventricular arrhythmias are separate outcomes.
Twenty participants meeting the protocol-approved opioid-free and negative naloxone-challenge criteria are randomised 1:1 against Cohort C. Participants attend monitored admissions at Months 0, 1 and 2 and receive matching oral placebo during each admission. XR-naltrexone 380 mg is administered intramuscularly on the planned calendar-monthly schedule at Months 0-11, for twelve injections. Participants receive equivalent preparation, clinical monitoring, psychological support, continuing care, monthly follow-up, SENTINEL support and Garmin monitoring through Month 12.
Pharmaceutical-quality ibogaine hydrochloride administered orally during monitored admissions at Months 0, 1 and 2 in Cohorts B and C. The formulation, strength, weight-capped dose ceiling, interaction controls, pharmacokinetic schedule, repeat-dose release criteria, residual-noribogaine criteria and stopping rules require approval in the controlled protocol and Investigator's Brochure. Each administration requires a documented eligibility and safety review. Arm Associations: B and C
Melinda Fouts
Basalt, Colorado, 81621, United States
First Submitted
Pre-dose through 72 hours after each assigned treatment administration at Months 0, 1 and 2.
Participants With QTcF of at Least 500 Milliseconds
Number of participants with at least one post-intervention, clinically interpreted 12-lead ECG showing a Fridericia-corrected QT interval (QTcF) of 500 milliseconds or more during any monitored admission. Each participant is counted once regardless of the number of qualifying ECGs. The reported unit is participants.
Pre-dose through 72 hours after each assigned treatment administration at Months 0, 1 and 2.
Participants With an Increase in QTcF of at Least 60 Milliseconds
Number of participants with at least one post-intervention increase in Fridericia-corrected QT interval (QTcF) of 60 milliseconds or more from the corresponding admission averaged pre-dose 12-lead ECG baseline. ECGs undergo clinical interpretation. Each participant is counted once regardless of the number of qualifying ECGs. The reported unit is participants.
Pre-dose through 72 hours after each assigned treatment administration at Months 0, 1 and 2.
Participants With a Protocol-Defined Ventricular Arrhythmia
Number of participants with torsade de pointes, sustained or clinically significant ventricular tachycardia, ventricular fibrillation, or another protocol-defined ventricular-arrhythmia stopping event during the acute monitoring windows. Events are determined from continuous telemetry, clinically interpreted 12-lead ECGs and clinical adjudication. Each participant is counted once. The reported unit is participants.
During the first 72 hours after each assigned treatment administration at Months 0, 1 and 2.
Area Under the Clinical Opiate Withdrawal Scale Total Score-Time Curve
Area under the total score-time curve from repeated Clinical Opiate Withdrawal Scale (COWS) assessments, reported in score-hours. COWS is an 11-item clinician-rated scale ranging from 0 to 48; higher scores indicate more severe withdrawal. The acute-withdrawal analysis population comprises participants with COWS of at least 5 at the prespecified pre-treatment baseline. Eligibility is assessed in each cohort, and results are reported separately by cohort. Cohort B is nonrandomised and is not pooled with Cohort C as a randomised comparison against Cohort A.
From pre-treatment baseline through 72 hours after the first assigned treatment administration in participants meeting the acute-withdrawal analysis criteria.
Area Under the Subjective Opiate Withdrawal Scale Total Score-Time Curve
From pre-treatment baseline through 72 hours after the first assigned treatment administration in participants meeting the acute-withdrawal analysis criteria.
Change From Baseline in Objective Opiate Withdrawal Scale Total Score
Pre-treatment baseline; 24, 48 and 72 hours and Day 7 after first assigned treatment; weekly through Month 3 and monthly during Months 4 to 12.
Participants Requiring Withdrawal Rescue Treatment
From the first assigned treatment administration through 72 hours.
Number of Non-Prescribed Opioid-Use Days
Pre-treatment baseline and monthly assessments through Month 12.
Percentage of Participants With Toxicology-Supported Non-Prescribed Opioid Abstinence
Months 1, 3, 6 and 12 after first assigned study treatment.
Change From Baseline in Garmin-Derived Total Sleep Duration
Daily during the pre-treatment baseline period and through Month 12; changes summarised separately for Months 1 to 12.
Change From Baseline in Garmin Derived Light Sleep Duration
Daily during the pre-treatment baseline period and through Month 12; changes summarised separately for Months 1 to 12.
Change From Baseline in Garmin Derived Deep Sleep Duration
Daily during the pre-treatment baseline period and through Month 12; changes summarised separately for Months 1 to 12.
Twenty participants enter nonrandomly through the protocol-approved recent-opioid-use pathway. Three oral administrations of pharmaceutical-quality ibogaine hydrochloride are planned during monitored admissions at Months 0, 1 and 2, subject to eligibility and individual repeat-dose release. Matching IM placebo is administered on the planned calendar-monthly schedule at Months 0-11. The first admission includes clinically supervised stabilisation when required, with up to 48 hours allowed in the planning model. Equivalent preparation, clinical monitoring, psychological support, continuing care, monthly follow-up and SENTINEL/Garmin support continue through Month 12.
Twenty participants meeting the shared opioid-free and negative naloxone-challenge criteria are randomised 1:1 against Cohort A. Three oral administrations of pharmaceutical-quality ibogaine hydrochloride are planned during monitored admissions at Months 0, 1 and 2, subject to eligibility and individual repeat-dose release. Matching IM placebo is administered on the planned calendar-monthly schedule at Months 0-11. Equivalent preparation, clinical monitoring, psychological support, continuing care, monthly follow-up and SENTINEL/Garmin support continue through Month 12.
Extended-release naltrexone 380 mg administered intramuscularly to Cohort A after the approved opioid-free interval, negative naloxone challenge and other clinical eligibility checks. The shared planning schedule is twelve calendar-monthly injections at Months 0-11. Exact timing, first-injection date, subsequent eligibility and missed-dose rules require D5 confirmation. Arm Associations: A
Matching oral placebo administered during the three monitored admissions at Months 0, 1 and 2 in Cohort A to maintain the double-dummy comparison. Composition, matching, manufacture, accountability and release follow the approved product documentation. Arm Associations: A
Matching intramuscular placebo administered every four weeks for 12 months.
SENTINEL is a study-provided digital monitoring and clinician-support platform used by all cohorts during baseline monitoring and 12-month follow-up. It combines daily participant reports, Garmin-derived longitudinal wellness data, scheduled psychometric assessments, adherence information, trend visualisation and protocol-defined risk-state classification. Orange, Red and Urgent states route to a named qualified clinician or emergency service under the escalation SOP. SENTINEL does not autonomously diagnose, prescribe, change medication or determine emergency treatment. It does not replace continuous telemetry, clinically interpreted 12-lead ECGs, toxicology, bedside examination or emergency assessment. Remote routines pause during scheduled acute admissions while clinical monitoring continues. Arm Associations: A, B and C
All cohorts receive standardised psychological preparation, supportive care during monitored admissions, post-treatment integration, weekly online support through Month 3, relapse-prevention planning, overdose-prevention education, continuing-care coordination and monthly face-to-face clinical support through Month 12. Support intensity is equivalent across cohorts. Rescue care, access to evidence-based addiction treatment and individual clinical needs take priority over preserving study allocation. Arm Associations: A, B and C
All cohorts receive a Garmin Venu 4 with a study-provided Apple phone, training and connectivity. Protocol-specified wellness information includes sleep, resting heart rate, overnight heart-rate variability, respiration, overnight oxygen-saturation estimates, steps, activity, all-day stress and Body Battery. Data support exploratory longitudinal trends in SENTINEL. The wearable is not used to measure QTc, diagnose arrhythmia or replace telemetry, 12-lead ECGs or clinical assessment. Valid-day and baseline rules and scheduled acute-admission pauses are defined in the data plan. Arm Associations: A, B and C
Contact the study team to confirm eligibility.
September 19, 2026
First Posted
October 13, 2026
Study Start
July 1, 2027
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
Primary Completion
January 31, 2029
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
Study Completion
December 31, 2029
EstimatedPlanned date reported by the registry; this milestone is not confirmed as achieved.
Last Updated
October 13, 2026
Record last verified: 2026-10
The sponsor plans to make available a deidentified individual-participant dataset underlying the primary and secondary results, together with the data dictionary, study protocol, statistical analysis plan, informed-consent form, and relevant analytic code. Access will be considered for qualified researchers whose proposed use has received scientific and ethical review and who enter into a data-use agreement protecting participant privacy, Indigenous and community interests, commercial confidential information, and investigational-product information. Data are expected to become available approximately 12 months after publication of the principal results and remain available for at least five years. Access will be provided through a controlled-access repository or secure analysis environment. Direct identifiers, free-text clinical conversations, exact locations, device identifiers, and other information presenting an unacceptable re-identification risk will not be released. Wearable da
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