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Cannabidiol enhancement of exposure therapy in patients with phobias.


- candidate number21801
- NTR NumberNTR5100
- ISRCTNISRCTN no longer applicable
- Date ISRCTN created
- date ISRCTN requested
- Date Registered NTR13-mrt-2015
- Secondary IDsZonMW protocol nr. 40-41200-98-9269 
- Public TitleCannabidiol enhancement of exposure therapy in patients with phobias.
- Scientific TitleCannabidiol enhancement of exposure therapy in treatment refractory patients with phobias.
- ACRONYM
- hypothesisThe aim of this research project is to investigate cannabidiol as a new medicine to target the cannabinoid system in the reduction of anxiety disorder symptoms. The research question is whether cannabidiol, as an augmentation strategy of exposure therapy in patients with phobic disorders (panic disorder with agoraphobia and social phobia), can speed up and/or increase the magnitude of change due to behavior treatment. We specifically want to target those subjects in whom previous treatment as usual (with SSRIs and/or psychotherapy) has not yielded in sufficient response to treatment, since it is this group that needs treatment enhancement most and therefore may benefit most from treatment enhancement with cannabidiol.
- Healt Condition(s) or Problem(s) studiedPhobias, Anxiety disorders
- Inclusion criteriaPatients will be invited to participate when they fulfill the diagnoses mentioned here-above, and provided that they have not or only partially responded to evidence-based treatment (either a full treatment with an SSRI (at least 12 weeks of sufficient dose) and/or at least 10 sessions of cognitive behavioural therapy) in the year preceding referral to the outpatient clinics.
- Exclusion criteriaPatients with co-morbid severe psychiatric disorders diagnosed with the SCID-I (severe major depressive or bipolar disorder, psychosis, dependence of alcohol and drugs), with mental deficiency (IQ<80) or inability to adequately read or speak Dutch will be excluded (assessed using a neuropsychological Test (NLV; Schmand et al. 1992), as well as persons with (a history of) epilepsy or brain damage, renal or liver abnormalities, and a history of allergies to medication (adverse reactions or rash). Regular use of benzodiazepines and of antipsychotics will be an exclusion criterion, contunued use of SSRIs will be permitted, provided that dosages are kept constant during the study. Lastly pregnant or breastfeeding women will be excluded from the study.
- mec approval receivedyes
- multicenter trialyes
- randomisedyes
- masking/blindingDouble
- controlPlacebo
- groupFactorial
- Type2 or more arms, randomized
- Studytypeintervention
- planned startdate 1-jun-2015
- planned closingdate1-jun-2019
- Target number of participants90
- InterventionsCannabidiol (capsule) or placebo (capsule), in combination with exposure therapy with response prevention (ERP)
- Primary outcomeThe primary outcome measure will be the fear questionnaire (FQ, Marks and Mathews 1979).
- Secondary outcomeClinical Global Impression and Subjective Unit of Distress Scale (SUDS; integral part of day by day treatment) and an assessment of the quality of the sessions are available weekly.
- TimepointsBaseline, 1st to 8th treatment, mid-treatment (week after 5th treatment), post-treatment (week after 8th treatment), follow up at 3 and 6 months
- Trial web site
- statusopen: patient inclusion
- CONTACT FOR PUBLIC QUERIES Febe van der Flier
- CONTACT for SCIENTIFIC QUERIESDr. Joke Baas
- Sponsor/Initiator Utrecht University (UU)
- Funding
(Source(s) of Monetary or Material Support)
ZON-MW, The Netherlands Organization for Health Research and Development
- Publications
- Brief summaryPhobic anxiety disorders are among the most prevalent disorders. The estimated lifetime prevalence is estimated at 19%. Also the estimated health care costs are high: 42 billion dollars in the USA annually. Antidepressants and cognitive behavioural therapy are effective but a substantial patient group shows insufficient improvement due to these standard treatments. Research has yielded solid evidence that the cannabinoid system in the brain is involved in the modulation of anxiety. Specifically, it seems to be influencing extinction of conditioned fear responses. An advantage of cannabidiol as opposed to cannabis (with THC) is that it doesn’t produce the ‘high’ feeling what THC (on itself or as part of cannabis) does. Patients possibly can benefit from the anxiolytic effect of cannabidiol. Cannabidiol is administered preceding cognitive behavioural therapy with exposure (exposure to a feared stimulus). If cannabidiol is found to be effective it might lead to adjustment of the guidelines.
- Main changes (audit trail)
- RECORD13-mrt-2015 - 9-mei-2016


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