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Could LSD help curb heavy drinking? new trial investigates

NCT ID NCT05474989

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 27, 2026

Summary

This phase 2 trial tests whether moderate to high doses of LSD can reduce heavy drinking in people with alcohol use disorder. 128 participants who have recently detoxified will receive either LSD or a low-dose placebo, along with therapy. The study tracks drinking behavior and brain changes over 30 weeks.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
LSD (lysergic acid diethylamide)
What this could lead to
If successful, this could provide a new treatment option to help people with alcohol use disorder reduce heavy drinking.
What could go wrong
This is a mid-stage trial with only 128 participants, so results may not apply to everyone. LSD can cause intense psychological effects, and the study is still recruiting.

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 2

Tests whether the treatment actually works, and watches for side effects, in a larger group.

Participants

About 128 people

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

Started

Jan 2026

Expected to finish

Apr 2029

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

25 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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.

Key inclusion criteria: * Age ≥ 25 years * Participants must meet the DSM-5 criteria for a moderate to severe alcohol use disorder and must intend to stop or decrease their drinking for at least the duration of the study * Participants must have underwent an alcohol detoxification within the 60 days prior to screening or, in cases where no detoxification is necessary, must have been abstinent for at least 14 days. * A minimum of 4 HDD within the last 30 days before detoxification or cessation of alcohol use (a HDD is defined as 5 or more standard drinks per day for a man and 4 drinks for a woman; a standard drink is defined as 12 g of alcohol) Key exclusion criteria: * Significant alcohol withdrawal symptoms at screening * Participating or starting in any formal treatment for AUD from visit 1 until completion of the double-blind phase * Treatment with disulfiram during the study * Past or present diagnosis of a DSM-5 psychotic or bipolar disorder in subjects or first-degree relatives * Current suicidality or history of a serious suicide attempt

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Conditions

The condition(s) this trial relates to.

As listed by the trial registrant

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

How to take part

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

  1. The places running it

    2 sites. 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

  • University Hospital of Psychiatry, University of Basel

    RECRUITING

    Basel, Switzerland

  • University Hospital of Psychiatry, University of Bern

    RECRUITING

    Bern, Switzerland

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