A Phase 3 interventional study of CYB003 and Psychological Support in Major Depressive Disorder (MDD), Depression in Adults and Depression - Major Depressive Disorder, sponsored by Cybin IRL Limited. Recruiting at 79 sites in 8 countries. Open to participants aged 18 Years to 85 Years. Per ClinicalTrials.gov, last updated 2026-11-02.
Sponsored by Cybin IRL Limited · Phase 3, Interventional, and Treatment
The purpose of this study is to determine the efficacy, safety and tolerability of CYB003 compared to matching placebo as adjunctive treatment in patients with MDD.
For more information about the EMBRACE study, including participating study locations, and to register your interest in learning more about participation, please visit the study website: https://embrace-mdd-trial.com/
3,041 studies on the registry are indexed under Depressive Disorder, Major; 588 are open to participants now.
This study's planned enrollment of 330 is above the median of 79 across 2,530 interventional studies indexed under Depressive Disorder, Major.
Browse Depressive Disorder, Major studies →Cybin IRL Limited is the lead sponsor of 5 studies on the registry; 2 are open to participants now.
Counted across the registry records on this site, refreshed daily.
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.
Participants must meet all the following criteria to be included in the trial:
Exclusion Criteria
Participants with any of the following characteristics/conditions will be excluded from trial participation:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
The American Psychiatric Association’s manual of mental health diagnoses. DSM-5 (2013, revised as DSM-5-TR in 2022) replaced DSM-IV, and some studies still name the older edition. “Meets DSM criteria for …” means diagnosed by that edition’s diagnostic criteria, usually by a clinician in an interview.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Periods have stopped for good: usually no period for 12 months in a row without another medical reason, sometimes confirmed by a blood test (FSH).
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
DSM diagnostic criteria
The American Psychiatric Association’s manual of mental health diagnoses. DSM-5 (2013, revised as DSM-5-TR in 2022) replaced DSM-IV, and some studies still name the older edition. “Meets DSM criteria for …” means diagnosed by that edition’s diagnostic criteria, usually by a clinician in an interview.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Postmenopausal
Periods have stopped for good: usually no period for 12 months in a row without another medical reason, sometimes confirmed by a blood test (FSH).
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Clinically significant
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Arm A participants will receive 8 mg of CYB003 in 2 of 2 medicine sessions, approximately three weeks apart. All Arm A participants will continue on their current antidepressants and receive psychological support throughout the study.
Drug: CYB003 · Behavioral: Psychological Support
Experimental Arm B participants will receive 16 mg of CYB003 in 2 of 2 medicine sessions, approximately three weeks apart. All Arm B participants will continue on their current antidepressants and receive psychological support throughout the study.
Drug: CYB003 · Behavioral: Psychological Support
Participants will receive placebo in 2 of 2 medicine sessions, approximately three weeks apart. All Arm C participants will continue on their current antidepressants and receive psychological support throughout the study. Non-responders will be eligible to receive CYB003 in a subsequent extension trial.
Behavioral: Psychological Support
CYB003 is a deuterated psilocin analog.
Manualized psychological support performed by facilitator.
Montgomery-Asberg Depression Scale (MADRS)
The MADRS is a 10-item scale with ratings based on a clinical interview which moves from broadly phased questions about symptoms to more detailed ones allowing a precise rating of severity. The total score ranges 0-60, higher scores denote greater severity.
Time frame: Screening Day-45, Baseline, Day -1, Day 21, Day 42, Day 63 and Day 84/End of Trial.
The Beck Depression Inventory - Second Edition (BDI-II)
The Beck Depression Inventory-Second Edition (BDI-II) is a 21-question multiple-choice self-report inventory, assessing depressive symptoms and severity. Each question is scored on a scale value of 0 to 3, with higher total scores indicating more severe depressive symptoms. Each of the 21 items corresponding to a symptom of depression is summed to give a single score for the BDI-II, so the total score possible is 63 and minimum if everything is zero would be 0.
Time frame: Day -1, Day 21, Day 42 and Day 84/End of Trial.
The Clinical Global Impression Scale (CGI-S)
The Clinical Global Impression Scale is a clinician-rated instrument comprised of 3 global measures: severity of illness, global improvement and efficacy index. Only the severity of illness ang global improvement measures will be utilized for this trial. Higher score means more severe symptomology, worse outcome. CGI-S scoring is as follows: 1. = Normal, not at all ill 2. = Borderline ill 3. = Mildly ill 4. = Moderately ill 5. = Markedly ill 6. = Severely ill 7. = Among the most extremely ill patients
Time frame: Screening Day-45, Baseline Day -1, Day 42, Day 84/End of Trial.
The Generalized Anxiety Disorder 7-Item Scale (GAD-7)
The Generalized Anxiety Disorder 7-Item Scale (GAD-7) is a 7-item self reported assessment that measures the severity of generalized anxiety disorder symptoms. Participants respond to each item using a 4-point scale from 0 to 3. Participants choose one of 4 severity scores associated with problems related to the common anxiety disorders to indicate the degree to which these problems caused functional and/or social difficulties. A total score is obtained by the sum of all total column values, higher scores indicate more functional/social impairment/difficulties. Score range is as follows: Scores represent: 0 - 4 = Minimal anxiety 5 - 9 = Mild anxiety 10 - 14 = Moderately anxiety 15 - 21 = Severe anxiety
Time frame: Baseline Day -1, Day 21, Day 42, Day 63 and Day 84/End of Trial.
The Quality of Life Enjoyment and Satisfaction Questionnaire - Short Form (Q-LES-Q-SF)
The original Quality of Life Enjoyment and Satisfaction Questionnaire is a 93 item, participant facing, self reported measure used to evaluate intervention-related changes in quality of life, divided int the following sections: physical health, feelings, work, household duties, school, leisure time activities, social relations and general activities. The Quality of Life Enjoyment and Satisfaction Questionnaire - Short Form (Q-LES-Q-SF) version will be used in this trial. Each item rated on a 5-point scale ranging from 1 (very poor) to 5 (very good), higher score indicates greater satisfaction. The scoring of the Q-LES-Q-SF involves summing only the first 14 items to yield a raw total score. The last two items are not included in the total score but are standalone items. The raw total score ranges from 14 to 70. So the minimum raw score on the Q-LES-Q-SF is 14, and the maximum score is 70
Time frame: Day -1, Day 21, Day 42 and Day 84/End of Trial.
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Plan to share: No
Started Dec 2025 (actual). Primary completion is estimated for Jun 2027, 17 months after the start.
Of 95 industry-sponsored phase 3 interventional studies under Depressive Disorder, Major, half reached primary completion within 26 months of starting (the median), counting those still running; a quarter within 20 and three quarters within 33. This study's planned 17 months is below that.
Counting every sponsor, half of 124 studies reached it within 27 months; a quarter within 21 and three quarters within 36.
Since we started tracking on Sep 25, 2026, the dates moved once, on Sep 25, 2026: primary completion Mar 2027 → Jun 2027 and completion May 2027 → Aug 2027.
Earlier changes are on the record history on ClinicalTrials.gov ↗
How these figures are worked out, and which studies are left out of them.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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Studies of the drug tested here: Deupsilocin
Cybin IRL Limited