A Phase 2 interventional study of Cannabidiol in Obsessive-Compulsive Disorder, Trichotillomania (Hair-Pulling Disorder) and Tourette Syndrome, sponsored by University of Chicago. Completed at 1 site in United States. Open to participants aged 18 Years to 65 Years. Per ClinicalTrials.gov, last updated 2026-07-29.
Sponsored by University of Chicago · Phase 2, Interventional, and Treatment
The primary objective of the proposed study is to evaluate the safety and efficacy of Epidiolex (cannabidiol) in adults with obsessive compulsive and related disorders (OCRDs). Subjects will be treated in an open-label fashion with Epidiolex for two weeks.
The primary objective of the proposed study is to evaluate the safety and efficacy of Epidiolex (cannabidiol) in adults with obsessive compulsive and related disorders (OCRDs). OCRDs include obsessive compulsive disorder (OCD), trichotillomania, skin picking, tourettes disorder, and hoarding disorders. These disorders appear linked in terms of phenomenology and possibly biology. Fifteen subjects with OCRDs will be treated in an open-label fashion with Epidiolex (2.5 mg/kg twice daily for one week followed by 5mg/kg twice daily) for two total weeks of active treatment. The hypothesis to be tested is that Epidiolex will result in reduction in symptoms of OCRDs (improvement in symptoms will be indicated by lower scores on established outcome measures of OCRDs symptoms that have been used in prior studies).
635 studies on the registry are indexed under Obsessive-Compulsive Disorder; 166 are open to participants now.
This study's enrollment of 4 is below the median of 45 across 520 interventional studies indexed under Obsessive-Compulsive Disorder.
Browse Obsessive-Compulsive Disorder studies →University of Chicago is the lead sponsor of 924 studies on the registry; 185 are open to participants now.
Of its 103 completed or terminated interventional studies of FDA-regulated products, 72 (70%) have results posted.
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.
Exclusion Criteria:
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Epidiolex (2.5 mg/kg twice daily for one week) followed by Epidiolex (5mg/kg twice daily for two weeks)
Drug: Cannabidiol
Epidiolex oral solution (2.5 mg/kg and 5 mg/kg)
Also known as: Epidiolex
Change in Yale Brown Obsessive Compulsive Scale (YBOCS) Total Score
The primary outcome measure will be the change from baseline using the Yale Brown Obsessive Compulsive Scale (YBOCS). The YBOCS is a 10-item scale that assesses OCD symptoms during the last seven days. The first five items comprise the urge/thought subscale and items 6-10 comprise the behavior subscale. The change in scores from baseline to Week 2 will be reported. The scores from the subscales are summed together to reach a total score. The scale ranges from 0-40 with higher scores reflecting more severe symptoms.
Time frame: Baseline to Week 2
Change in NIMH Symptom Severity Scale (for TTM or Skin Picking) Total Score
The primary efficacy measure will be the change in hair pulling or skin picking frequency and urges to pull hair or pick skin for the past week as indicated by change in total score. The entire study lasts two weeks. Every two weeks subjects will take the NIMH-TSS. The change in scores from baseline to Week 2 will be reported. The scale itself assesses severity of trichotillomania symptoms. The NIMH-TSS score ranges from 0 to 20, with 0 being no symptoms and 20 being the most severe.
Time frame: Baseline to Week 2
Change in Clinical Global Impressions- Severity Scale (CGI-S) Total Score
The entire study for the subject will last 2 weeks. The subject will complete the CGI once per week. The change in scores from baseline to Week 2 will be reported. The scale itself assesses overall disorder severity on a scale from 1 to 7 with 1 being "not at all" and 7 being "among the most severe cases"
Time frame: Baseline to Week 2
Change in Hamilton Depression Rating Scale (HAM-D) Total Score
The Hamilton Depression Rating Scale (HAM-D) is a clinician-administered assessment of depression that will be assessed at all study visits. The HAM-D is a 17-item scale that assess depressive symptoms during the last seven days. The change in scores from baseline to Week 2 will be reported. The scale ranges from 0-52 with higher total scores indicating higher levels of depression, while a score of 0 would indicate no depressive symptoms.
Time frame: Baseline to Week 2
Change in Hamilton Anxiety Rating Scale (HAM-A) Total Score
The Hamilton Anxiety Rating Scale (HAM-A) is a clinician-administered assessment of anxiety that will be assessed at all study visits. The HAM-A is a 14 item scale that assess anxiety symptoms during the last fourteen days. The change in scores from baseline to Week 2 will be reported. The scale ranges from 0-56 with higher scores indicating higher levels of anxiety, with 0 being no symptoms of anxiety.
Time frame: Baseline to Week 2
Change in Sheehan Disability Scale (SDS) Total Score
The Sheehan Disability Scale (SDS) is a self-report scale that subjects will complete the SDS at all visits. The SDS is a three item scale that measures functional impairment across work/school, social life, and family/home responsibilities during the past seven days. The change in scores from baseline to Week 2 will be reported. Each item ranges from 0-10, with higher scores indicating more impairment. However, only total score is reported which ranges from 0-30, with higher scores indicating more severe impairment. The total score is computed by summing the three scores from each domain. The scale itself assesses the level of disability from target disorder with higher scores indicating a more debilitating disorder.
Time frame: Baseline to Week 2
Change in Quality of Life Inventory (QOLI) Total Score
The Quality of Life Inventory (QOLI) is a self-report assessment of patient perceived quality of life that will be assessed at each visit. The change in scores from baseline to Week 2 will be reported. The QOLI assesses both the importance and satisfaction of 16 life domains. Scores are calculated by multiplying the importance score by the satisfaction score which gives a weighted score for each domain. Each weighted score is then added together to get a total score which ranges from 0-100 with higher scores indicating a higher quality of life, whereas lower scores indicate a lower quality of life.
Time frame: Baseline to Week 2
| Milestone | Epidiolex |
|---|---|
| Started | 4 |
| Completed | 2 |
| Not completed | 2 |
The primary outcome measure will be the change from baseline using the Yale Brown Obsessive Compulsive Scale (YBOCS). The YBOCS is a 10-item scale that assesses OCD symptoms during the last seven days. The first five items comprise the urge/thought subscale and items 6-10 comprise the behavior subscale. The change in scores from baseline to Week 2 will be reported. The scores from the subscales are summed together to reach a total score. The scale ranges from 0-40 with higher scores reflecting more severe symptoms.
| Score on a scale | Epidiolex |
|---|---|
| Change in Yale Brown Obsessive Compulsive Scale (YBOCS) Total Score | 2 ± 4.24 |
The primary efficacy measure will be the change in hair pulling or skin picking frequency and urges to pull hair or pick skin for the past week as indicated by change in total score. The entire study lasts two weeks. Every two weeks subjects will take the NIMH-TSS. The change in scores from baseline to Week 2 will be reported. The scale itself assesses severity of trichotillomania symptoms. The NIMH-TSS score ranges from 0 to 20, with 0 being no symptoms and 20 being the most severe.
No measurements were reported for this outcome.
The entire study for the subject will last 2 weeks. The subject will complete the CGI once per week. The change in scores from baseline to Week 2 will be reported. The scale itself assesses overall disorder severity on a scale from 1 to 7 with 1 being "not at all" and 7 being "among the most severe cases"
| Score on a scale | Epidiolex |
|---|---|
| Change in Clinical Global Impressions- Severity Scale (CGI-S) Total Score | 0 ± 1.41 |
The Hamilton Depression Rating Scale (HAM-D) is a clinician-administered assessment of depression that will be assessed at all study visits. The HAM-D is a 17-item scale that assess depressive symptoms during the last seven days. The change in scores from baseline to Week 2 will be reported. The scale ranges from 0-52 with higher total scores indicating higher levels of depression, while a score of 0 would indicate no depressive symptoms.
| Score on a scale | Epidiolex |
|---|---|
| Change in Hamilton Depression Rating Scale (HAM-D) Total Score | 1.5 ± 7.78 |
The Hamilton Anxiety Rating Scale (HAM-A) is a clinician-administered assessment of anxiety that will be assessed at all study visits. The HAM-A is a 14 item scale that assess anxiety symptoms during the last fourteen days. The change in scores from baseline to Week 2 will be reported. The scale ranges from 0-56 with higher scores indicating higher levels of anxiety, with 0 being no symptoms of anxiety.
| Score on a scale | Epidiolex |
|---|---|
| Change in Hamilton Anxiety Rating Scale (HAM-A) Total Score | 0.5 ± 0.71 |
The Sheehan Disability Scale (SDS) is a self-report scale that subjects will complete the SDS at all visits. The SDS is a three item scale that measures functional impairment across work/school, social life, and family/home responsibilities during the past seven days. The change in scores from baseline to Week 2 will be reported. Each item ranges from 0-10, with higher scores indicating more impairment. However, only total score is reported which ranges from 0-30, with higher scores indicating more severe impairment. The total score is computed by summing the three scores from each domain. The scale itself assesses the level of disability from target disorder with higher scores indicating a more debilitating disorder.
| Score on a scale | Epidiolex |
|---|---|
| Change in Sheehan Disability Scale (SDS) Total Score | 0 ± 9.90 |
The Quality of Life Inventory (QOLI) is a self-report assessment of patient perceived quality of life that will be assessed at each visit. The change in scores from baseline to Week 2 will be reported. The QOLI assesses both the importance and satisfaction of 16 life domains. Scores are calculated by multiplying the importance score by the satisfaction score which gives a weighted score for each domain. Each weighted score is then added together to get a total score which ranges from 0-100 with higher scores indicating a higher quality of life, whereas lower scores indicate a lower quality of life.
| Score on a scale | Epidiolex |
|---|---|
| Change in Quality of Life Inventory (QOLI) Total Score | -3.5 ± 4.95 |
Collected over Adverse event data was collected at all three visits over the course of 2 weeks. This includes the baseline visit to the Week 2 visit.. Non-serious events are listed at a 0% frequency threshold.
| Group | Deaths | Serious | Other |
|---|---|---|---|
| Epidiolex | 0/4 (0%) | 0/4 (0%) | 1/4 (25%) |
| Event | Epidiolex |
|---|---|
| DiarrheaGastrointestinal disorders | 1/4 |
| Age, Continuous(Years) | Epidiolex |
|---|---|
| Mean | 26 ± 6.63 |
| Sex: Female, Male(Participants) | Epidiolex |
|---|---|
| Female | 3 |
| Male | 1 |
| Race (NIH/OMB)(Participants) | Epidiolex |
|---|---|
| American Indian or Alaska Native | 0 |
| Asian | 1 |
| Native Hawaiian or Other Pacific Islander | 0 |
| Black or African American | 0 |
| White | 3 |
| More than one race | 0 |
| Unknown or Not Reported | 0 |
| Ethnicity (NIH/OMB)(Participants) | Epidiolex |
|---|---|
| Hispanic or Latino | 1 |
| Not Hispanic or Latino | 3 |
| Unknown or Not Reported | 0 |
PDFs hosted by the registry, ClinicalTrials.gov.
Plan to share: No
Ran from Apr 2022 to primary completion in Nov 2025, 42 months.
Results were first posted in Jul 2026, 8 months after primary completion.
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Studies of the drug tested here: Cannabidiol
Obsessive-Compulsive Disorder →