Phase 2 Pilot Safety Study of MDMA-assisted Therapy for Social Anxiety in Autistic Adults

May 23, 2025 updated by: Lykos Therapeutics

A Placebo-controlled, Randomized, Blinded, Dose Finding Phase 2 Pilot Safety Study of MDMA-assisted Therapy for Social Anxiety in Autistic Adults

The goal of this clinical trial is to learn if MDMA-assisted therapy is safe and effective at reducing social anxiety in adults with autism.

The main questions it aims to answer are:

  • Do two sessions of MDMA-assisted therapy reduce social anxiety?
  • What dose of MDMA is most effective at reducing social anxiety?

Researchers will compare two blinded sessions of MDMA-assisted therapy to two blinded sessions of placebo with therapy.

Participants will undergo three non-drug preparatory therapy sessions before the first blinded medication session. After each medication session, participants will undergo three non-drug integrative therapy sessions.

In Stage 2, participants who received placebo with therapy in the first two blinded sessions will be able to undergo two sessions with MDMA-assisted therapy.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The main objective of this study was to collect safety data to examine whether MDMA-assisted therapy was tolerated and to estimate symptom reduction in social anxiety and other psychiatric symptoms that are common in the adult autistic population as evaluated by standard clinical measures. The primary outcome measure was change in social anxiety symptoms as measured by the Liebowitz Social Anxiety Scale (LSAS) [Heimberg et al., 1999].

Each of the 12 subjects participated in two blinded experimental sessions, with either MDMA or placebo, which lasted seven hours. Before experimental sessions, participants underwent three separate hour-long preparatory sessions to learn what to expect and complete pre-treatment assignments. After each experimental session, participants underwent three separate hour-long integrative sessions to help integrate their experiences and insights from the experimental sessions.

This study was designed as a dose escalation study to assist with the exploration of safety and finding the most effective dose in this population. Upon enrollment, participants (Group 1) were randomized to receive one dose of either placebo or 75 mg of midomafetamine HCl. In the second experimental session one month later, Group 1 subjects randomized to MDMA escalated to 100 mg of midomafetamine HCl, unless contraindicated. The second group of subjects enrolled (Group 2) were randomized to receive one dose of either placebo or 100 mg of midomafetamine HCl. In the second experimental session one month later, Group 2 subjects randomized to MDMA escalated to 125 mg of midomafetamine HCl, unless contraindicated.

The blind was maintained through the six-month follow-up. In Stage 2 after the blind was broken, subjects who received placebo in Stage 1 were offered an open-label extension with two experimental sessions of MDMA-assisted therapy scheduled one month apart. Subjects received 75 mg of midomafetamine HCl in the first session and escalated to 125 mg of midomafetamine HCl in the second session, unless contraindicated.

Study Type

Interventional

Enrollment (Actual)

12

Phase

  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • California
      • Torrance, California, United States, 90502
        • Los Angeles Biomedical Research Institute

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

17 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Have a diagnosis of Autism Spectrum Disorder.
  • Have social anxiety.
  • Are at least 21 years old.
  • Have completed two years of college-level education or comparable vocational training.
  • Are willing to refrain from psychiatric medication for at least 5 half-lives plus a week prior to experimental session.
  • Agree to follow all study-related instructions and restrictions, including restrictions on food, alcohol and caffeine consumption prior to experimental sessions.
  • Are willing to commit to preparatory sessions, medication management, experimental sessions, follow-up sessions and to complete evaluation instruments.
  • Agree not to use MDMA/ecstasy outside of study sessions during the study, including the follow up period.
  • Are willing to be contacted on a daily basis for a week after each experimental session.
  • Are willing to provide a contact that is willing and able to be reached by investigators, accompany the subject during some or all of the study visits, and complete study measures.
  • Are willing to give blood samples.
  • Are proficient in speaking and reading English. Subjects communicating with text-to-speech technology will also be permitted to enroll.

Exclusion Criteria:

  • Upon review of medical or psychiatric history must not have any current or past diagnosis that would be considered a risk to participation in the study.
  • Are abusing illegal drugs.
  • Are not able to give adequate informed consent.
  • Are not able to attend face-to-face visits or those who plan to move out of the area within the treatment period.
  • Are pregnant or nursing, or if are able to bear children and do not practice an effective means of birth control.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Triple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Placebo Comparator: Inactive Placebo with Therapy
Participants will receive inactive placebo during two psychotherapy sessions lasting approximately 7 hours.
Drug: Placebo
Subjects will receive capsules of lactose of identical appearance to MDMA capsules during each of two experimental sessions. Capsules will be administered along with therapy.
Other Names:
  • Inactive placebo
Behavioral: Therapy
Therapy conducted throughout experimental sessions. Therapists will use a largely nondirective approach. There will be periods of structured and unstructured interactions. The structured interactions will be selected based on elements of therapeutic interventions that are currently in use in this population for the treatment of social anxiety.
Other Names:
  • Manualized therapy
Experimental: Group 1: MDMA-assisted therapy 75 mg/100mg
Participants will receive 75 mg and 100 mg midomafetamine HCl during two sessions of MDMA-assisted therapy, respectively, lasting approximately 7 hours.
Behavioral: Therapy
Therapy conducted throughout experimental sessions. Therapists will use a largely nondirective approach. There will be periods of structured and unstructured interactions. The structured interactions will be selected based on elements of therapeutic interventions that are currently in use in this population for the treatment of social anxiety.
Other Names:
  • Manualized therapy
Drug: Midomafetamine HCl
Participants in Group 1 receive 75 or 100 mg during the two experimental sessions and participants in Group 2 receive 100 or 125 mg during two experimental sessions.
Other Names:
  • MDMA
  • 3,4-methylenedioxymethamphetamine
Experimental: Group 2: MDMA-assisted therapy 100 mg/125 mg
Participants will receive 100 mg and 125 mg midomafetamine HCl during two sessions of MDMA-assisted therapy, respectively, lasting approximately 7 hours.
Behavioral: Therapy
Therapy conducted throughout experimental sessions. Therapists will use a largely nondirective approach. There will be periods of structured and unstructured interactions. The structured interactions will be selected based on elements of therapeutic interventions that are currently in use in this population for the treatment of social anxiety.
Other Names:
  • Manualized therapy
Drug: Midomafetamine HCl
Participants in Group 1 receive 75 or 100 mg during the two experimental sessions and participants in Group 2 receive 100 or 125 mg during two experimental sessions.
Other Names:
  • MDMA
  • 3,4-methylenedioxymethamphetamine

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Liebowitz Social Anxiety Scale (LSAS) Total Score 1-Month Post Experimental Session 2
Time Frame: 1-Month Post Experimental Session 2
The LSAS is a 24-item, semi-structured interview on the severity of Social Anxiety Disorder. The LSAS separately assesses fear and avoidance of 24 social situations. The scale is divided into 2 subscales, 13 situations concerning performance anxiety, and 11 situations pertaining to social situations. The 24 items are first rated on a Likert Scale from 0 to 3 on fear felt during the situations, and then the same items are rated regarding avoidance of the situation. Combining the total scores for the Fear and Avoidance sections provides an overall score with a maximum of 144 points and a minimum of 0 points. The higher the score, the greater the anxiety symptoms. The overall scores are interpreted as: 55-65 is moderate, 65-80 is marked, 80-95 is severe, and greater than 95 is very severe social anxiety symptoms.
1-Month Post Experimental Session 2
Change in Leibowitz Social Anxiety Scale (LSAS) Total Score From Baseline to 1-Month Post Experimental Session 2
Time Frame: Baseline to 1-Month Post Experimental Session 2
The LSAS is a 24-item, semi-structured interview on the severity of Social Anxiety Disorder. The LSAS separately assesses fear and avoidance of 24 social situations. The scale is divided into 2 subscales, 13 situations concerning performance anxiety, and 11 situations pertaining to social situations. The 24 items are first rated on a Likert Scale from 0 to 3 on fear felt during the situations, and then the same items are rated regarding avoidance of the situation. Combining the total scores for the Fear and Avoidance sections provides an overall score with a maximum of 144 points and a minimum of 0 points. The higher the score, the greater the anxiety symptoms. The overall scores are interpreted as: 55-65 is moderate, 65-80 is marked, 80-95 is severe, and greater than 95 is very severe social anxiety symptoms.
Baseline to 1-Month Post Experimental Session 2

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Lykos Therapeutics

Collaborators

Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center

Investigators

  • Principal Investigator: Charles S. Grob, MD, University of California, Los Angeles

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

April 11, 2014

Primary Completion (Actual)

April 28, 2017

Study Completion (Actual)

April 28, 2017

Study Registration Dates

First Submitted

December 6, 2013

First Submitted That Met QC Criteria

December 6, 2013

First Posted (Estimated)

December 11, 2013

Study Record Updates

Last Update Posted (Actual)

June 5, 2025

Last Update Submitted That Met QC Criteria

May 23, 2025

Last Verified

May 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • MAA-1

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

We will share outcome data appearing in any published reports upon request.

IPD Sharing Time Frame

Data and study-related documents will be available when all participants have completed the study

IPD Sharing Access Criteria

Interested persons should correspond with the central contact for the study.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • ICF

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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