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Brain scans reveal how opioid addiction affects key receptors

NCT ID NCT05683184

Knowledge-focused Sponsor: Yale University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Sep 11, 2026 · Updated 6 times

Summary

This study uses brain scans to compare a specific receptor (CB1) in people with opioid use disorder who are on methadone treatment versus healthy volunteers. The goal is to understand how the endocannabinoid system works differently in addiction. No new treatment is tested; it is purely observational.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 1

The first testing in people. Mainly checks safety and dose, usually in a small group.

Participants

About 30 people

The number the study aims to enrol. It can still change while the study runs.

Started

Mar 2023

Expected to finish

Dec 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Able to provide informed consent * Male and female 18 years and older * DSM-5 diagnosis of opioid use disorder (for OUD group) * Physically healthy i.e., no clinically unstable medical conditions * Written informed consent and have capacity to consent and comply with study procedures Exclusion Criteria: * Current neuro-psychiatric illness or severe systemic disease (opioid use disorder is permitted in the OUD group). * Presence of ferromagnetic metal in the body or heart pacemaker * Have had exposure to ionizing radiation that in combination with the study tracer would result in a cumulative exposure that exceeds recommended exposure limits * Are claustrophobic * Hematocrit values lower than 30

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Conditions

The condition(s) this trial relates to.

opiate dependence

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Healthy control Opioid-use disorder

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Connecticut Mental Health Center, Clinical Neuroscience Research Unit

    RECRUITING

    New Haven, Connecticut, 06519, United States

More trials for these conditions

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