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TerminatedNCT05839509Updated Feb 18, 2025

Phase 2 Clinical Trial of GH001 in Bipolar II Disorder

A Phase 2 interventional study of GH001 in Bipolar II Disorder, sponsored by GH Research Ireland Limited. Terminated at 7 sites in 3 countries. Open to participants aged 18 Years to 64 Years. Per ClinicalTrials.gov, last updated 2025-02-18.

Sponsored by GH Research Ireland Limited · Phase 2, Interventional, and Treatment

Why this study was terminated
Recruitment of this patient population was more challenging than anticipated. The sponsor concluded that a sufficient amount of patients have completed the trial to demonstrate proof of concept in this patient population.
Phase
Phase 2
Study type
Interventional
Enrollment
6
Allocation
Not applicable
Ages
18 Years to 64 Years
Sex
All
01

Study summary

This study is a multicenter, open-label, single-arm Phase 2 clinical trial. Approximately 15 participants with clinically diagnosed bipolar disorder (BD) type II and experiencing a current episode of depression will be included in this study. The participants will receive an individualized dosing regimen (IDR) with at least one and up to three doses of GH001 administered within a single day.

02

Conditions studied

  • Bipolar II Disorder

Keywords

  • Depression
  • Bipolar Disorder
  • 5-Methoxy-N,N-Dimethyltryptamine
  • 5-MeO-DMT
  • Mebufotenin
03

In context

Bipolar Disorder

1,637 studies on the registry are indexed under Bipolar Disorder; 258 are open to participants now.

This study's enrollment of 6 is below the median of 63 across 1,245 interventional studies indexed under Bipolar Disorder.

Browse Bipolar Disorder studies →

Lead sponsor

GH Research Ireland Limited is the lead sponsor of 9 studies on the registry; none are open to participants now.

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

04

Who can participate

Ages eligible
18 Years to 64 Years
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • Is male or female and in the age range between 18 and 64 years (inclusive) at screening
  • Has a body mass index (BMI) in the range of 18.5 and 35 kg/m2 (inclusive) at screening
  • Meets the trial criteria for bipolar II disorder and is experiencing a major depressive episode, as assessed by a trial psychiatrist or registered clinical psychologist

Exclusion criteria

Exclusion Criteria:

  • Has bipolar II disorder with rapid cycling (four or more episodes of hypomania or depressive episodes in previous 12-month period)
  • Has, based on history, psychiatric assessment, and evaluation of the MINI, a current or prior diagnosis of bipolar I disorder, a manic episode, a psychotic disorder, MDD or other mood disorder with psychotic features, obsessive compulsive disorder, PTSD, autism spectrum disorder, borderline personality disorder, schizophrenia, delusional disorder, paranoid personality disorder, schizoaffective disorder, clinically significant intellectual disability, or any other psychiatric comorbidity that renders the patient unsuitable for the trial according to the investigator's judgment
  • Has one or more first degree relatives with a current or previously diagnosed psychotic disorder, bipolar I disorder or MDD with psychotic features
  • Has taken prohibited medication or prohibited dietary supplements within the specified timeframe prior to dosing
  • Has previously experienced a significant adverse reaction to a hallucinogenic or psychedelic drug according to the investigator's judgment
  • Has a clinically significant abnormality in physical examination, vital signs, ECG, or clinical laboratory parameters which renders the patient unsuitable for the trial according to the investigator's judgment
05

Study design

Phase
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
6 participants (actual)

Study arms

  • Experimental
    GH001 Individualized Dosing Regimen

    GH001 (Mebufotenin, 5-Methoxy-N,N-Dimethyltryptamine) is administered via inhalation, as an IDR consisting of up to 3 increasing doses of GH001 (6 mg, 12 mg, and 18 mg), on a single day. The second and third doses are only administered if the patient did not achieve intense psychoactive effects (a peak experience \[PE\]) at the previously administered dose.

    Drug: GH001

Interventions

  • DrugGH001

    GH001 administered via inhalation

    Also known as: 5-Methoxy-N,N-Dimethyltryptamine, 5-MeO-DMT, Mebufotenin

06

What researchers measure

Primary outcomes

  1. The anti-depressive effects of GH001 evaluated by the change from baseline in Montgomery-Åsberg Depression Rating Scale (MADRS) assessed at Day 7

    The MADRS is a ten-item diagnostic questionnaire used to measure the severity of depressive episodes in patients with mood disorders. A higher MADRS score indicates more severe depression, and each item is scored from 0 to 6. The overall score ranges from 0 to 60.

    Time frame: From Baseline to Day 7

07

Study locations

7 sites
  • Investigational Site
    Dresden, Germany
  • Investigational Site
    Frankfurt, Germany
  • Investigational Site
    Münster, Germany
  • Investigational Site
    Leiden, Netherlands
  • Investigational Site
    Maastricht, Netherlands
  • Investigational Site
    London, United Kingdom
  • Investigation Site
    Oxford, United Kingdom
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 Feb 18, 2025, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT05839509
Lead sponsor
GH Research Ireland Limited
Responsible party
Sponsor
First posted
May 3, 2023
Start date
Apr 6, 2023
Primary completion
Nov 13, 2024
Completion
Dec 5, 2024
Last update
Feb 18, 2025

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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

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Studies of the drug tested here: Methoxydimethyltryptamines

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