Generalized Anxiety DisorderPhase 2NCT06051721
A Study of a N, N-dimethyltryptamine (DMT) Analog (CYB004) in Participants With Generalized Anxiety Disorder (GAD)
A Phase 2 study testing CYB004 and Psychotherapy in people with Generalized Anxiety Disorder, run by Cybin IRL Limited at 6 sites in United States.
Trial summary
The purpose of this proof-of-concept trial is to examine the safety, tolerability, and pharmacokinetics (PK), and preliminary clinical efficacy of CYB004 participants with GAD. Read more about this study
- Who is it for?
- Ages 18 to 65 years
- Conditions the study is for
- Generalized Anxiety Disorder
- What is being tested?
- CYB004 and Psychotherapy
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 36 participants
- Where
- 6 sitesUnited States
- Study dates
- 10 May 2024to 5 Aug 2026
- Phase
- Phase 2
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 65 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Aged between 18 to 65 years, inclusive, at Screening.
- Has a diagnosis of GAD (as defined in the Diagnostic and Statistical Manual of Mental Disorders, 5th edition [DSM-V] of moderate to severe degree), established through a full psychiatric work up.
- Has a BMI of 18 to 40.0 kg/m2, inclusive at Screening.
- Has been on a stable dose of antidepressant/anxiolytic medication (no more than 50% change) in the last month prior to Screening and has had an inadequate response, as judged by the Investigator.
- Is willing to refrain from taking any benzodiazepines for 5 days or buspirone (or other 5-HT1A agonist) during the 24 hours preceding each dosing visit.
- Provision of giving written informed consent, which includes compliance with the requirements and restrictions listed in the consent form.
Who cannot join
- Has a primary DSM-5 psychiatric diagnosis other than GAD within the past 6 months established through a full psychiatric work-up. A secondary diagnosis of MDD may be permissible.
- Current or previously diagnosed schizophrenia spectrum or other psychotic disorders, including schizophrenia, schizoaffective disorder, schizotypal disorder, schizophreniform disorder, brief psychotic disorder or borderline personality disorder; current or previous history of psychosis or bipolar disorder.
- Currently taking a monoamine oxidase inhibitor, tricyclic antidepressant, trazadone, mirtazapine, or a mood stabilizer (including lithium) or has taken any of these medications in the last 3 weeks of trial participation.
- Currently taking antipsychotic medication which are 5-HT2 antagonists or has taken such medication in the last 3 weeks of trial participation.
- Clinically significant risk of suicidality, as determined through a comprehensive psychiatric interview.
- Clinically relevant history of abnormal physical health interfering with the study as determined by medical history and physical examinations obtained during Screening as judged by the Investigator (including [but not limited to], neurological, endocrine, cardiovascular, respiratory, gastrointestinal, hepatic, or renal disorder).
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- Currently receiving treatment for hypertension or arrhythmia.
- Clinically relevant abnormal laboratory results.
- History or clinical evidence of any disease and/or existence of any surgical or medical condition which might interfere with the absorption, distribution, metabolism or excretion of the study drug.
- Any other concomitant disease or condition that could interfere with, or for which the treatment might interfere with the conduct of the trial, or that would, in the opinion of the Investigator, pose an unacceptable risk to the participant in this trial.
- Has a presence or relevant history of any organic brain disorders (e.g., epilepsy, seizure, intracranial hypertension, intracranial bleed and aneurysmal disease, brain tumor or other medical conditions associated with seizures or convulsions).
- Consumes excessive amounts of caffeine (e.g., coffee, tea, caffeinated sodas) or (methyl) xanthines (e.g., chocolate) based on the Investigator's determination and discretion.
- Positive urine test for drugs of abuse or alcohol breath test at Screening or Day 1. A positive test for cannabinoids (e.g. marijuana) at Screening may not exclude a participant if after discussion with and evaluation by the Investigator, the participant agrees not to use any marijuana or other cannabinoid products during the study, and if allowed to participate, the participant must test negative for cannabinoids on Day 1 and Day 22.
- Has participated in a clinical trial and has received a medication or a new chemical entity within 3 months prior to dosing of current study medication.
- Known sensitivity to DMT or ayahuasca.
- Is taking a prescription medicine (except for stable chronic dose of antidepressant/anxiolytic medication(s), sedatives/hypnotics, and hormonal contraceptives or hormonal replacement medications, if applicable), certain herbal supplements (to be reviewed by the Investigator), or over-the-counter (OTC) medicine during the 28 days before dosing.
- Is taking or has taken over the counter (OTC) doses of 5-hydroxytryptophan or St John's Wort within 28 days prior to receiving the study drug.
- Donation of blood or plasma of >400 mL within 1 month prior to first dosing until 4 weeks after final dosing.
- For participants capable of producing sperm: Is not willing to abstain from sperm donation between first dosing and 3 months after final dosing.
- For participants capable: Is pregnant, breastfeeding or planning to conceive.
- Not fluent in the English language.
- Other eligibility considerations (i.e., participant personal circumstances, behavior, and/or any current problem that might interfere with participation or that is incompatible with establishment of rapport or safe exposure to the study drug), as judged by the Investigator.
Trial locations and contacts
6 sites in 1 country.
6 sites in 1 country
United States6 sites
CenExel ACMR
Atlanta, Georgia, 30331
Uptown Research Institute
Chicago, Illinois, 60640
iResearch Atlanta
Decatur, Georgia, 30330
Research Centers of America
Hollywood, Florida, 33024
Innovative Clinical Research, Inc.
Miami Lakes, Florida, 33016
Cedar Clinical Research
Murray, Utah, 84107
About this study
Official title: A Phase 2a, Randomized, Double-Blind, Active-Controlled Study to Assess the Preliminary Clinical Efficacy, Safety, Tolerability, and Pharmacokinetics, of CYB004 in Participants With Generalized Anxiety Disorder (GAD)
The purpose of this proof-of-concept trial is to examine the safety, tolerability, and pharmacokinetics (PK), and preliminary clinical efficacy of CYB004 participants with GAD.
- Conditions
- Generalized Anxiety Disorder
- Being tested
- CYB004, Psychotherapy
- Keywords
- Generalized Anxiety Disorder, GAD, Depression, CYB004, CYB004-002, Psychedelic, DMT, N, N-dimethyltryptamine
- Medical subject headings
- Generalized Anxiety Disorder, Depression
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
CYB004Drug
CYB004 is a synthetic deuterated N, N-Dimethyltryptamine (DMT) analog.
PsychotherapyBehavioural
Manualized psychotherapy (called EMBARK) performed by facilitators
| Study group | Role | What they receive |
|---|---|---|
| Arm A: Active | Experimental | Arm A participants will receive a full dose of CYB004 in 2 of 2 medicine sessions, approximately three weeks apart. All participants will receive supportive EMBARK psychotherapy throughout the study. Receives: Drug: CYB004; Behavioral: Psychotherapy |
| Arm B: Control | Active comparator | Arm B participants will receive a low dose of CYB004 in 2 of 2 medicine sessions, approximately three weeks apart. All participants will receive supportive EMBARK psychotherapy throughout the study. Receives: Drug: CYB004; Behavioral: Psychotherapy |
What is being measured
The primary outcome is the main question the study is designed to answer.
Hamilton Anxiety Rating Scale (HAM-A)
The HAM-A is a 14-item scale that is used to rate the severity of symptoms of anxiety. Each of the 14 items is defined by a series of symptoms and measures both psychic anxiety (mental agitation and psychological distress) and somatic anxiety (physical complaints related to anxiety). Items are scored from 0 (not present) to 4 (very severe), for a total score ranging from 0 to 56. Scores <17 indicate mild anxiety, scores of 18 to 24 indicate mild to moderate anxiety, and scores of 25 to 30 or higher indicate moderate to severe anxiety.
Measured: Screening (Day-63 and Day-1), Day 2, Day 8, Day 21, Day 23, Day 29, Day 43, Day 64, Day 85, Day 169, Day 266, and End of Treatment (Day 364)
Secondary outcomes (1)
Hamilton Depression Scale (HAM-D)
The HAM-D is a validated 17-item questionnaire administered by the clinician used to assess severity of, and change in, depressive symptoms in the past week. The questionnaire assesses core symptoms of depression, anxiety, and side effects of drug treatment on a scale of 0 to 50 with higher scores indicating more severe depression. Scores of 0-7 are considered normal, 8-16 suggest mild depression, 17-23 moderate depression and scores over 24 are indicative of severe depression (Zimmerman et al., 2013); the maximum score being 52 on the 17-point scale.
Measured: Screening (Day-63 and Day-1), Day 2, Day 8, Day 21, Day 23, Day 29, Day 43, Day 64, Day 85, Day 169, Day 266, and End of Treatment (Day 364)
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted25 Sep 2023
- Study start10 May 2024
- Primary completion14 Oct 2025
- Study completion5 Aug 2026
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Generalized Anxiety DisorderStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 2
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Quadruple blind
- Who is masked
- Participant, Care provider, Investigator, Outcomes assessor
- Enrolment
- 36 participants (actual)
Sponsor and investigators
- Lead sponsor
- Cybin IRL Limited
- Sponsor type
- Industry (pharma, biotech, devices)
- Collaborators
- Worldwide Clinical Trials
- Responsible party
- Sponsor
- Investigators
- Amir Inamdar, MBBS, DNB, MFPM, Study director, Cybin IRL Limited
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06051721
- Sponsor's protocol ID
- CYB004-002
- Status last verified
- Aug 2026
- First submitted
- 13 Sep 2023
- Last updated
- 13 Aug 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 13 Aug 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Phase 2a, Randomized, Double-Blind, Active-Controlled Study to Assess the Preliminary Clinical Efficacy, Safety, Tolerability, and Pharmacokinetics, of CYB004 in Participants With Generalized Anxiety Disorder (GAD)
- ClinicalTrials.gov ID
- NCT06051721
- Acronym / sponsor ID
- CYB004-002
- Conditions
- Generalized Anxiety Disorder
- Keywords
- Generalized Anxiety Disorder, GAD, Depression, CYB004, CYB004-002, Psychedelic, DMT, N, N-dimethyltryptamine
- Phase
- Phase 2
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 36 participants (actual)
- Lead sponsor
- Cybin IRL LimitedIndustry (pharma, biotech, devices)
- Collaborators
- Worldwide Clinical Trials
- Study start
- 10 May 2024 (actual)
- Primary completion
- 14 Oct 2025 (actual)
- Study completion
- 5 Aug 2026 (actual)
- First posted
- 25 Sep 2023 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The purpose of this proof-of-concept trial is to examine the safety, tolerability, and pharmacokinetics (PK), and preliminary clinical efficacy of CYB004 participants with GAD.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Quadruple blind (participant, care provider, investigator, outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Arm A: Active | Experimental | Drug: CYB004, Behavioral: PsychotherapyArm A participants will receive a full dose of CYB004 in 2 of 2 medicine sessions, approximately three weeks apart. All participants will receive supportive EMBARK psychotherapy throughout the study. |
| Arm B: Control | Active comparator | Drug: CYB004, Behavioral: PsychotherapyArm B participants will receive a low dose of CYB004 in 2 of 2 medicine sessions, approximately three weeks apart. All participants will receive supportive EMBARK psychotherapy throughout the study. |
Who may qualify
- Ages
- 18 to 65 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (6 listed)
- Aged between 18 to 65 years, inclusive, at Screening.
- Has a diagnosis of GAD (as defined in the Diagnostic and Statistical Manual of Mental Disorders, 5th edition [DSM-V] of moderate to severe degree), established through a full psychiatric work up.
- Has a BMI of 18 to 40.0 kg/m2, inclusive at Screening.
- Has been on a stable dose of antidepressant/anxiolytic medication (no more than 50% change) in the last month prior to Screening and has had an inadequate response, as judged by the Investigator.
- Is willing to refrain from taking any benzodiazepines for 5 days or buspirone (or other 5-HT1A agonist) during the 24 hours preceding each dosing visit.
Key exclusion criteria (22 listed)
- Has a primary DSM-5 psychiatric diagnosis other than GAD within the past 6 months established through a full psychiatric work-up. A secondary diagnosis of MDD may be permissible.
- Current or previously diagnosed schizophrenia spectrum or other psychotic disorders, including schizophrenia, schizoaffective disorder, schizotypal disorder, schizophreniform disorder, brief psychotic disorder or borderline personality disorder; current or previous history of psychosis or bipolar disorder.
- Currently taking a monoamine oxidase inhibitor, tricyclic antidepressant, trazadone, mirtazapine, or a mood stabilizer (including lithium) or has taken any of these medications in the last 3 weeks of trial participation.
- Currently taking antipsychotic medication which are 5-HT2 antagonists or has taken such medication in the last 3 weeks of trial participation.
- Clinically significant risk of suicidality, as determined through a comprehensive psychiatric interview.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| CYB004CYB004 is a synthetic deuterated N, N-Dimethyltryptamine (DMT) analog. | Drug | Arm A: Active, Arm B: Control |
| PsychotherapyManualized psychotherapy (called EMBARK) performed by facilitators | Behavioural | Arm A: Active, Arm B: Control |
Primary outcome
Hamilton Anxiety Rating Scale (HAM-A)
Time frame: Screening (Day-63 and Day-1), Day 2, Day 8, Day 21, Day 23, Day 29, Day 43, Day 64, Day 85, Day 169, Day 266, and End of Treatment (Day 364)
The HAM-A is a 14-item scale that is used to rate the severity of symptoms of anxiety. Each of the 14 items is defined by a series of symptoms and measures both psychic anxiety (mental agitation and psychological distress) and somatic anxiety (physical complaints related to anxiety). Items are scored from 0 (not present) to 4 (very severe), for a total score ranging from 0 to 56. Scores <17 indicate mild anxiety, scores of 18 to 24 indicate mild to moderate anxiety, and scores of 25 to 30 or higher indicate moderate to severe anxiety.
1 secondary outcome
Hamilton Depression Scale (HAM-D)
Time frame: Screening (Day-63 and Day-1), Day 2, Day 8, Day 21, Day 23, Day 29, Day 43, Day 64, Day 85, Day 169, Day 266, and End of Treatment (Day 364)
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 13 Aug 2026.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Amir Inamdar, MBBS, DNB, MFPM study director
Cybin IRL Limited
6 sites in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 2 study testing CYB004 and Psychotherapy in people with Generalized Anxiety Disorder, run by Cybin IRL Limited at 6 sites in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 6 inclusion and 22 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 13 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 6 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Hamilton Anxiety Rating Scale (HAM-A) (time frame: Screening (Day-63 and Day-1), Day 2, Day 8, Day 21, Day 23, Day 29, Day 43, Day 64, Day 85, Day 169, Day 266, and End of Treatment (Day 364)). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 13 Aug 2026.