• Disruptive behavior and irritability: Limited. In a 2021 trial of 150 children and young adults, a 20:1 CBD: THC whole-plant extract improved disruptive behavior on the clinician’s rating but not on the parent questionnaire (Aran 2021). A 2025 trial of purified CBD in boys with severe behavior problems found no benefit over placebo on its main measures (Trauner 2025).

• Social responsiveness and anxiety: Limited. A 2025 analysis of the randomized trials found moderate gains in social responsiveness and small reductions in disruptive behavior and anxiety, from few, small studies (European Psychiatry 2025).

• Core autism traits: Not established.

Compared with standard treatment: Behavioral therapies and two FDA-approved medicines for irritability (risperidone and aripiprazole) have stronger evidence.

Good to know: Most patients studied were children. Sleepiness and lower appetite were more common on cannabinoids. CBD raises blood levels of some seizure medicines, which many autistic patients take. Involve the child’s pediatrician or specialist.

What to ask for: A CBD-dominant oral product with very little THC (20:1 CBD: THC was studied), started low and adjusted by a specialist. Avoid inhaled products.