Efficacy of a Therapeutic Combination of Dronabinol and PEA for Tourette Syndrome

Phase 2

Completed

Brief Summary: This is an investigator-initiated proof of concept study with the purpose to examine the safety, tolerability and feasibility of Dronabinol (synthetic Δ9-THC) and PEA for the treatment of adults with Tourette syndrome.

Detailed Description: The investigators propose a 12-week, investigator-initiated, open-label trial of a therapeutic combination of Dronabinol and PEA in 18 adults with Tourette syndrome. Participants will receive Dronabinol and PEA in combination for the duration of the trial. The goal for this pilot study is to (1) provide initial safety, feasibility and tolerability data on both Dronabinol and PEA in a TS population and (2) provide data in order to make a more informed decision regarding the appropriate sample size and design of a larger clinical trial to prove efficacy (i.e. sample size and trial duration in large efficacy trial of the Dronabinol/PEA combination in TS).

Recruitment & Eligibility

Inclusion Criteria

Adult between 18-60 years of age
Meet DSM-5 criteria for the diagnosis of Tourette syndrome
Significant current tic symptoms: YGTSS total tic score greater than or equal to 22 at baseline
On stable psychiatric medication regimen for a minimum of 4 weeks prior to beginning the trial
Accepted method of birth control

Exclusion Criteria

Comorbid bipolar disorder, psychotic disorder, substance use disorder, developmental disorder or intellectual disability (IQ<70)
Recent change (less than 4 weeks) in other medications that have potential effects on tic severity (such as alpha-2 agonists (guanfacine, clonidine or prazosin), SSRIs, clomipramine, naltrexone, lithium, anxiolytics, topiramate, baclofen etc.). Medication change is defined to include dose changes or medication discontinuation.
Recent change in behavioral treatment for Tourette syndrome or comorbid conditions (i.e. OCD) within the last 4 weeks or initiation of behavioral therapy for tics within the last 12 weeks.
Taking any co-medications (over the counter or prescription), food supplements/additives which can have a drug interaction with dronabinol or PEA.
Positive pregnancy test or drug screening test
History of cannabis dependence
Significant Medical Comorbidity
History of hypersensitivity to any cannabinoid or sesame oil

Arm && Interventions

Group	Intervention	Description
Dronabinol and Palmitoylethanolamide	Dronabinol and Palmitoylethanolamide	All participants will be titrated up on Dronabinol dose during the first week of the trial (2.5mg Dronabinol for 3 days and then 5mg Dronabinol for 4 days increasing to 10mg Dronabinol for the remainder of the trial). Dronabinol will only be increased to 10mg at the week 1 assessment if the subject is tolerating the 5mg dose of Dronabinol and the Dronabinol may be reduced based on patient side-effects. All participants will receive two 400mg tablets of PEA daily for the same 12 weeks that they receive the Dronabinol.

Primary Outcome Measures

Name	Time	Method
Changes in Tic Severity	12 weeks	Yale Global Tic Severity Scale (YGTSS) (Total Tic Score) The YGTSS tool gives ratings in 5 domains: Total Motor Tic Score, Total Verbal Tic Score, Total Tic Score (Motor + Verbal), Overall Impairment Rating, and Global Severity Score. When calculating the Global Severity score, it is found by adding together the total motor, verbal and impairment scores. The Total Tic Severity Score has a range of 0-50, and the Global Severity Score has a range of 0- 100. A higher score on all scales suggests a more severe Tic, or a greater impact the Tic has on the person's life.

Secondary Outcome Measures

Name	Time	Method

Locations (1): Yale Child Study Center
🇺🇸
New Haven, Connecticut, United States

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