What does early evidence say about cannabis for autism spectrum disorder? | Research

The takeaway

A review of preclinical and clinical data found potential therapeutic benefit for cannabis and CBD in autism spectrum disorder, with authors adding their own clinical experience treating children and young adults.

Pediatric neurologists, autism specialists, parents of children with ASD, and cannabis researchers.

No effective treatment exists for ASD core symptoms; cannabis shows early promise

What the researchers found

The review found emerging preclinical evidence linking the endocannabinoid system to ASD pathophysiology and limited clinical data suggesting cannabis and CBD may improve core symptoms (social interaction, communication), noncore behaviors (aggression, self-injury), and comorbidities. The authors clinical experience supported these findings, noting overall tolerability.

Why it matters

No effective treatment exists for ASD core symptoms. Cannabis and CBD represent one of the few emerging therapeutic options, but evidence remains very early-stage, making careful clinical reviews particularly valuable.

The numbers in context

No effective treatment for ASD core symptoms currently exists; limited clinical data from small studies and case series reviewed.

How the study worked

Narrative review of preclinical and clinical data on cannabis/CBD for ASD core symptoms, noncore symptoms, and comorbidities, supplemented by authors clinical experience with ASD patients using cannabis.

What this study cannot tell us

Very limited clinical data; no large RCTs; narrative review format; clinical experience is anecdotal; ASD heterogeneity makes generalizing difficult; long-term safety in developing brains unknown.

How to read the evidence

Preliminary: limited clinical data, no large RCTs, supplemented by anecdotal clinical experience.

When this study was published

Published 2020.

The bigger picture

The endocannabinoid system is involved in social behavior, emotion regulation, and neuroplasticity, all relevant to ASD. While the biological rationale is plausible, the evidence has not yet caught up to parental demand for cannabis-based treatments.

Questions still open

Would different CBD-to-THC ratios work better for different ASD symptoms? Can we identify which ASD subgroups respond best to cannabinoid treatment?

Common questions

Does cannabis help autism?

Early preclinical and clinical data suggest potential benefit for both core symptoms and associated behaviors. However, the evidence is very limited and no large controlled trials have been completed.

Is cannabis safe for children with autism?

The review found cannabis and CBD were generally well tolerated in clinical experience, but long-term safety data in developing brains are lacking. This remains an active area of research.

Read the original research

Autism Spectrum Disorder and Medical Cannabis: Review and Clinical Experience.

Seminars in pediatric neurology, 35, 100833

View on PubMed ↗Publisher’s paper ↗

Citation

Mostafavi, Mojdeh; Gaitanis, John. (2020). Autism Spectrum Disorder and Medical Cannabis: Review and Clinical Experience.. Seminars in pediatric neurology, 35, 100833. https://doi.org/10.1016/j.spen.2020.100833