CClinicalTrials.gg
CompletedNCT04895215Updated Nov 21, 2025

AB-2004 in Treatment of Irritability Associated With Autism Spectrum Disorder (ASD)

A Phase 2 interventional study of AB-2004 and Placebo in Autism Spectrum Disorder (ASD), sponsored by Vertero Therapeutics. Completed at 24 sites in 3 countries. Open to participants aged 5 Years to 17 Years. Per ClinicalTrials.gov, last updated 2025-11-21.

Sponsored by Vertero Therapeutics · Phase 2, Interventional, and Treatment

From the registry’s dates

  • Primary completion was Nov 2023, 2 years 10 months ago, and no results have been posted to the registry.
Phase
Phase 2
Study type
Interventional
Enrollment
156
Allocation
Randomized
Ages
5 Years to 17 Years
Sex
All
01

Study summary

The purpose of this study is to establish the potential benefits, safety, and tolerability of AB-2004 in participants with irritability associated with autism spectrum disorder.

02

Conditions studied

  • Autism Spectrum Disorder (ASD)

Keywords

  • Irritability
  • Anxiety
03

In context

Autism Spectrum Disorder

1,727 studies on the registry are indexed under Autism Spectrum Disorder; 504 are open to participants now.

This study's enrollment of 156 is above the median of 52 across 1,371 interventional studies indexed under Autism Spectrum Disorder.

Browse Autism Spectrum Disorder studies →

Lead sponsor

Vertero Therapeutics is the lead sponsor of 3 studies on the registry; 2 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
5 Years to 17 Years
Sexes eligible
All
Accepts healthy volunteers
No

Eligibility criteria

Key Inclusion Criteria:

  • Clinically diagnosed, documented ASD (Diagnostic and Statistical Manual of Mental Disorders [DSM-5] criteria)
  • Aberrant Behavior Checklist - Irritability (ABC-I) score ≥18 at the Screening Period
  • Clinical Global Impression - Severity (CGI-S) scale score ≥4 at the Screening Period

Key Exclusion Criteria:

  • Use of an oral, injected, or inhaled antibiotic within 30 days prior to screening. Prophylactic oral antibiotic use of no more than 1 dose will be permitted
  • Current use of an oral controlled or extended-release medication
  • Have a comorbid major psychiatric condition (eg, schizophrenia or bipolar disorder) at screening that in the opinion of the Investigator may interfere with the subject's ability to complete study procedures/comply with study requirements
  • Current use of antipsychotics (eg, aripiprazole or risperidone)
05

Study design

Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Triple (Participant, Care provider, Investigator)
Enrollment
156 participants (actual)

Study arms

  • Experimental
    AB-2004

    Drug: AB-2004

  • Placebo comparator
    Placebo

    Drug: Placebo

Interventions

  • DrugAB-2004

    Taken 3 times daily with food

  • DrugPlacebo

    Take 3 times daily with food

06

What researchers measure

Primary outcomes

  1. The mean change in the ABC-I score (Irritability) from Baseline to Week 8 for AB-2004

    Time frame: From baseline to Week 8 visit

Secondary outcomes

  1. The mean change in the Clinical Global Impression-Severity (CGI-S) from Baseline to Week 8 for AB-2004 High Dose and AB-2004 Low Dose

    Time frame: From baseline to Week 8 visit

  2. Number of participants who reported treatment emergent adverse events (TEAEs)

    Time frame: From baseline to Week 8 visit

07

Study locations

24 sites
  • Harmonex Neuroscience Research
    Dothan, Alabama 36303, United States
  • Southwestern Autism Research and Resource Center
    Phoenix, Arizona 85006, United States
  • University of Arizona
    Tucson, Arizona 85724, United States
  • Cortica Marin
    San Rafael, California 94903, United States
  • Cortica Westlake
    Westlake Village, California 91361, United States
  • IMMUNOe Research Centers
    Centennial, Colorado 80112, United States
  • Yale University
    New Haven, Connecticut 06519, United States
  • CNS Solutions
    Jacksonville, Florida 32256, United States
  • CNS Solutions
    Orlando, Florida 32801, United States
  • University of South Florida
    Tampa, Florida 33613, United States
  • Baber Research
    Naperville, Illinois 60563, United States
  • University of Missouri, Thompson Center for Autism and Neurodevelopmental Disorders
    Columbia, Missouri 65201, United States
  • Clinical Research of Southern Nevada
    Las Vegas, Nevada 89128, United States
  • Spectrum Neuroscience and Treatment Institute
    New York, New York 10021, United States
  • Nathan S. Kline Institute for Psychiatric Research
    Orangeburg, New York 10962, United States
  • Ohio State University
    Columbus, Ohio 43210, United States
  • Vanderbilt University Medical Center
    Nashville, Tennessee 37212, United States
  • Relaro Medical Trials
    Dallas, Texas 75243, United States
  • Brain Mind Centre
    Sydney, New South Wales 2050, Australia
  • Westmead Children's Hospital
    Sydney, New South Wales 2145, Australia
  • Children's Health Queensland Hospital
    South Brisbane, Queensland 4101, Australia
  • Monash Kids Research
    Clayton, Victoria 3186, Australia
  • Murdoch Children's Research Institute
    Parkville, Victoria 3052, Australia
  • Optimal Clinical Trials
    Grafton, Auckland 1010, New Zealand
08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Nov 21, 2025, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT04895215
Lead sponsor
Vertero Therapeutics
Responsible party
Sponsor
First posted
May 20, 2021
Start date
Aug 2, 2021
Primary completion
Nov 15, 2023
Completion
Dec 15, 2023
Last update
Nov 21, 2025

Oversight

FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Nov 2025. You cannot join it, but the record below documents what was studied.

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