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GH001

Phase 2

Treatment Resistant Depression | Small molecule | Psychiatry |GH Research PLC|Trials Updated: Oct 7, 2026

GH001 development status

Highest phase Phase 2
Registered trials 4 across 2 sponsors since Sep 2021

GH001 target and mechanism

ModalitySmall molecule

Also known as Mebufotenin, 5-MeO-DMT

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLED
Total Trials6
Total Enrollment242

FDA Designations

No designations recorded

GH001 clinical trials

GH001 · 6 trials · 6 indications

Phase 2 1Phase 1 5
NCT05800860A Trial of GH001 in Patients With Treatment-resistant DepressionTreatment-resistant Depression
COMPLETED81 Analytics
PHASE2COMPLETED
A Trial of GH001 in Patients With Treatment-resistant Depression
Treatment-resistant DepressionUnlock trial analytics

Study Endpoints

Primary Endpoints

Mean change in MADRS from Baseline to Day 7
Baseline to Day 7

The assessment is done with the MADRS, a diagnostic questionnaire with ten items for measuring 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.

Serum PK parameters of mebufotenin - maximum observed concentration (Cmax)
Day 1

For PK analyses, blood samples will be collected before and up to 6 hours after the administration of GH001 to determine mebufotenin serum concentrations.

Serum PK parameters of mebufotenin - time of maximum observed concentration (Tmax)
Day 1

For PK analyses, blood samples will be collected before and up to 6 hours after the administration of GH001 to determine mebufotenin serum concentrations.

Serum PK parameters of mebufotenin - terminal elimination half-life (t1/2)
Day 1

For PK analyses, blood samples will be collected before and up to 6 hours after the administration of GH001 to determine mebufotenin serum concentrations.

Serum PK parameters of mebufotenin - area under the serum concentration-time curve from time zero to the last quantifiable concentration (AUClast)
Day 1

For PK analyses, blood samples will be collected before and up to 6 hours after the administration of GH001 to determine mebufotenin serum concentrations.

Serum PK parameters of mebufotenin - area under the serum concentration-time curve extrapolated to infinity (AUCinf)
Day 1

For PK analyses, blood samples will be collected before and up to 6 hours after the administration of GH001 to determine mebufotenin serum concentrations.

Serum PK parameters of mebufotenin - Partial area under the curve between t1 and t2 (AUCt1-t2)
Day 1

For PK analyses, blood samples will be collected before and up to 6 hours after the administration of GH001 to determine mebufotenin serum concentrations.

Serum PK parameters of mebufotenin - terminal elimination rate constant (λz)
Day 1

For PK analyses, blood samples will be collected before and up to 6 hours after the administration of GH001 to determine mebufotenin serum concentrations.

Serum PK parameters of mebufotenin - apparent total body clearance (CL/F)
Day 1

For PK analyses, blood samples will be collected before and up to 6 hours after the administration of GH001 to determine mebufotenin serum concentrations.

Serum PK parameters of mebufotenin - Apparent volume of distribution (up to bioavailability) following extravascular administration (Vz/F)
Day 1

For PK analyses, blood samples will be collected before and up to 6 hours after the administration of GH001 to determine mebufotenin serum concentrations.

Serum PK parameters of mebufotenin - Cmax/AUCinf
Day 1

For PK analyses, blood samples will be collected before and up to 6 hours after the administration of GH001 to determine mebufotenin serum concentrations.

Safety and tolerability: incidence of treatment-emergent adverse events
Through trial completion, an average of 3 weeks

Incidence of adverse events reported in the study and coded by MedDRA.

Safety and tolerability: incidence of treatment emergent adverse events
Up to 7 days

Adverse events reported in the study and coded by MedDRA.

Safety and tolerability: local tolerance (injection site reactions)
Up to discharge on dosing day

Local infusion site findings will be assessed as none, mild, moderate and severe for the following signs and symptoms of the applicable site: dryness, redness, swelling, pain, tenderness, and itching and other.

Safety and tolerability: Clinically significant changes from baseline in ECG, vital signs and safety laboratory assessments
Up to 7 days

Clinically significant changes in ECG include any significant change in rate or rhythm as determined by the principal investigator

Safety and tolerability: Assessment of sedation (Modified Observer's Assessment of Alertness and Sedation [MOAA/S]) following each dose and as part of the discharge evaluation on Day 0
Up to discharge on dosing day

The Modified Observer's Assessment of Alertness and Sedation scale (MOAA/S) will be completed before and after GH002 dosing. Scored from 0 (deep sedation) to 5 (alert)

Safety and tolerability: Change from baseline in Clinician Administered Dissociative States Scale (CADSS)
Up to 7 days

The CADSS comprises 19 subjective items, ranging from 0 'not at all' to 4 'extremely. Summed together, these subscales form a total dissociative score. Combined score ranges from 0 to 76

Safety and tolerability: Assessment of subject-discharge readiness at discharge on Day 0
Up to discharge on dosing day

Assessment of Discharge Readiness on the administration day by the Principal Investigator, using the Clinical Assessment of Discharge Readiness (CADR).

Safety and tolerability: Columbia-Suicide Severity Rating Scale (C-SSRS) categorization based on the Columbia Classification Algorithm of Suicide Assessment (C-CASA).
Up to 7 days

A detailed questionnaire assessing both suicidal behaviour and suicidal ideation.

Safety and tolerability: Change from baseline in Brief Psychiatric Rating Scale (BPRS).
Up to 7 days

A scale to measure psychiatric symptoms. Each symptom is rated 1-7 and a total of 18 symptoms are scored. Combined score ranges from 18 to 126.

The pharmacokinetic (PK) parameters derived from laboratory assay results of the systemic levels of 5-MeO-DMT
Up to 6 hours

For PK analyses, blood samples will be collected before and up to 6 hours after the administration of GH002 to determine 5-MeO-DMT serum concentrations.

The pharmacokinetic (PK) parameters derived from laboratory assay results of the systemic levels of 5-MeO-DMT and bufotenine
up to 4 hours

For PK analyses, blood samples will be collected before and up to 4 hours after the administration of GH001 to determine 5-MeO-DMT and bufotenine serum concentrations.

Phase 1: The safety and tolerability of GH001 as a combined measure of outcomes 5 to 13.
up to 7 days

Phase 1: The primary endpoint is a binary variable (yes/no) reflecting a combined medical/clinical evaluation of the occurrence of Outcomes 5 to 13. The endpoint will be considered met for any dose level or regimen if the Study Safety Group (SSG) - through a qualitative medical/clinical evaluation - considers that dose level or regimen sufficiently safe and tolerable for potential further clinical development in a subsequent study.

Phase 2: The effects of GH001 on the severity of depression evaluated by the Montgomery-Asberg Depression Rating Scale (MADRS)
up to 7 days

Phase 2: The assessment is done with the Montgomery-Asberg Depression Rating Scale (MADRS), a diagnostic questionnaire with ten items for measuring 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.

The safety and tolerability of GH001
up to 7 days

The safety and tolerability of GH001 is judged by the Study Safety Group based on a combined analysis of reported adverse events, clinical observation, and safety laboratory analyses.

The dose-related psychoactive effects of GH001 as evaluated by a Visual Analogue Scale
Retrospectively assessed at 3 hours

Visual Analogue Scale scored from 0-100

Secondary Endpoints

Pharmacodynamic assessment: The dose-related psychoactive effects of GH002 as evaluated by a Visual Analogue Scale
Up to 1 hour after dosing
Pharmacodynamic assessment: Challenging Experiences Questionnaire (CEQ)
Up to 1 hour after dosing
Pharmacodynamic assessment: 30-Question Mystical Experience Questionnaire (MEQ30)
Up to 1 hour after dosing
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
GH001 - Part 1EXPERIMENTALGH001 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.
Placebo - Part 1PLACEBO_COMPARATORPlacebo is administered via inhalation, as an IDR consisting of up to 3 doses of Placebo, on a single day. The second and third doses are only administered if the patient did not achieve intense psychoactive effects (a PE) at the previously administered dose.
Open-Label Extension (OLE) - Part 2OTHERPatients can receive up to five GH001 IDRs as needed during the OLE based on the patient's clinical response.
GH001EXPERIMENTALA single inhaled dose of GH001 administered via a proprietary aerosol delivery device in 12 subjects
Cohort A: Dose A single doseEXPERIMENTALA single dose of GH002 or placebo administered by i.v. bolus injection (randomized as 6 active and 2 placebo subjects)
Cohort B: Dose B single doseEXPERIMENTALA single dose of GH002 or placebo administered by i.v. bolus injection (randomized as 6 active and 2 placebo subjects)
Cohort C: Dose C single doseEXPERIMENTALA single dose of GH002 or placebo administered by i.v. bolus injection (randomized as 6 active and 2 placebo subjects)
Cohort D: Dose D single doseEXPERIMENTALA single dose of GH002 or placebo administered by i.v. bolus injection (randomized as 6 active and 2 placebo subjects)
Cohort E: Dose E single doseEXPERIMENTALA single dose of GH002 or placebo administered by i.v. bolus injection (randomized as 6 active and 2 placebo subjects)
Cohort F: Dose F single doseEXPERIMENTALA single dose of GH002 or placebo administered by i.v. bolus injection (randomized as 6 active and 2 placebo subjects)
Cohort G: Dose G single doseEXPERIMENTALA single dose of GH002 or placebo administered by i.v. bolus injection (randomized as 6 active and 2 placebo subjects)
Cohort J: Individualized Dosing RegimenEXPERIMENTALAdministration of up to 3 doses of GH002 within a single day (doses to be confirmed following review of data from single-dose part)
Group A - 6 mg single-doseEXPERIMENTALA single, inhaled dose of GH001 6 mg or placebo (randomized as 8 active and 2 placebo subjects)
Group B - 12 mg single-doseEXPERIMENTALA single, inhaled dose of GH001 12 mg or placebo (randomized as 8 active and 2 placebo subjects)
Group C - 18 mg single-doseEXPERIMENTALA single, inhaled dose of GH001 18 mg or placebo (randomized as 8 active and 2 placebo subjects)
Group D - Individualized Dosing Regimen, 1-hour intervalEXPERIMENTALAdministration of up to 3 inhaled doses of GH001 within a single day (6 mg, followed by 12 mg, followed by 18 mg) with a 1-hour dose interval (8 subjects)
Group E - Individualized Dosing Regimen, 2-hour intervalEXPERIMENTALAdministration of up to 3 inhaled doses of GH001 within a single day (6 mg, followed by 12 mg, followed by 18 mg) with a 2-hour dose interval (8 subjects)
Phase 1 (Part A): GH001 dose AEXPERIMENTAL -
Phase 1 (Part A): GH001 dose BEXPERIMENTAL -
Phase 2 (Part B): GH001 Individualized Dosing RegimenEXPERIMENTAL -
GH001 dose AEXPERIMENTAL -
GH001 dose BEXPERIMENTAL -
GH001 dose CEXPERIMENTAL -
GH001 dose DEXPERIMENTAL -
GH001 Individualized DosingEXPERIMENTAL -

Interventions

NameTypeDescription
GH001DRUGGH001 administered via inhalation
PlaceboDRUGPlacebo administered via inhalation
5 Methoxy N,N DimethyltryptamineDRUGGH001 administered via inhalation
GH001 Aerosol Delivery SystemDEVICEGH001 aerosol delivery system
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Eligibility Criteria

Age Range18 Years to 64 Years
SexALL
Healthy VolunteersNo
Study Sites11

Main Inclusion Criteria: 1. Is in the age range between 18 and 64 years (inclusive) at the time of informed consent; 2. Meets the trial criteria for TRD as assessed by a study psychiatrist: 1. Meets the Diagnostic and Statistical Manual of Mental Disorders 5 (DSM-5) criteria for single-episode ...

Countries:CzechiaGermanyIrelandNetherlandsPolandSpainUnited States
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Recent Changes (Last 90 Days)

HIGHOct 7, 2026NCT07540494Status: NOT_YET_RECRUITING → COMPLETED
HIGHOct 7, 2026NCT07540494Status: NOT_YET_RECRUITING → COMPLETED

Frequently asked questions about GH001

What is GH001?

GH001 is an investigational small molecule developed by GH Research PLC (ticker GHRS). It is being studied in healthy adult volunteers and in patients with treatment-resistant depression. The program includes completed Phase 1 pharmacokinetic and safety trials in healthy volunteers and a completed Phase 2 trial in treatment-resistant depression.

What is GH001 used for in treatment-resistant depression?

GH001 is being developed as a potential treatment for treatment-resistant depression, a condition in which patients do not respond adequately to standard antidepressant therapies. A completed Phase 2 trial, NCT05800860, evaluated GH001 in 81 patients with treatment-resistant depression across Czechia, Germany, Ireland, the Netherlands, Poland, and Spain.

Who makes GH001?

GH001 is developed by GH Research PLC, which trades under the ticker GHRS. The company sponsors the clinical program for GH001, including the Phase 1 pharmacokinetic and safety studies in healthy volunteers and the Phase 2 trial in treatment-resistant depression.

What phase is GH001 in?

GH001 is in clinical development. Its Phase 1 trials in healthy volunteers have been completed, and a Phase 2 trial in treatment-resistant depression has also been completed. GH001 is investigational and has not been approved by the FDA for any indication.

What clinical trials is GH001 in?

GH001 has been studied in completed trials including NCT07540494, which assessed pharmacokinetics and safety of GH001 delivered via a GH001 aerosol delivery system in healthy subjects; NCT05163691, a pharmacokinetics trial in healthy volunteers; and NCT05800860, a Phase 2 trial in patients with treatment-resistant depression.

Is GH001 the same as 5 Methoxy N,N Dimethyltryptamine?

Yes, GH001 is also known as 5 Methoxy N,N Dimethyltryptamine. That alternative name refers to the same investigational small molecule being developed by GH Research PLC under the designation GH001 for study in healthy volunteers and treatment-resistant depression.