Evaluating the impact of cannabis oil for autistic children with and without concomitant medications: Insights from an open-label study.

Publication date: Jul 04, 2025

Although only two drugs are FDA approved for autism spectrum disorder (ASD), clinical practice treatment includes off-label use of medications to address the troubling symptoms of ASD. Several trials showed the beneficial effects of medical cannabis for alleviating symptoms of ASD. However, data are lacking regarding its safety and effectiveness as a single agent compared to add-on therapy. To compare the safety and effectiveness of medical cannabis as a monotherapy and add-on therapy in autistic children. An open-label trial recruiting autistic children was performed and treated with medical cannabis oil with a THC:CBD ratio of 1:20, respectively. Tests were conducted at baseline and after 6 months of therapy. A secondary analysis was done to compare physical and behavior parameters, using tests such as Autism Diagnostic Observation Schedule and Wechsler tests in the two groups. Out of 109 participants, 81 completed the treatment. Thirty received cannabis as add-on therapy to a pre-existing treatment, whereas 51 received cannabis as monotherapy, with no observed differences in baseline characteristics between the groups. The mean maximal CBD dose was 3. 1 mg/kg/day in the monotherapy group, compared to 2. 8 mg/kg/day in the add-on group (p = 0. 40). In patients treated with drugs for psychosis, the mean maximal dose was 2. 48 mg/kg/day (p = 0. 12). No differences were observed in most physical and behavioral parameters. In addition, no differences in CBD blood levels were observed. Add-on cannabis therapy is as safe as monotherapy treatment, without significant differences in efficacy.

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