Highest medicinal dose of cannabidiol is driver-safe, study confirms

Linda Rider

Millions of consumers and people all over the world will be heartened by the results of the latest examine on cannabis and driving. The College of Sydney-led study finds that 1500mg, the highest every day medicinal dose of cannabidiol (CBD), has no influence on people’s driving or cognitive abilities.

CBD is a cannabis part widely utilised for health-related as properly as ‘wellness’ applications, these types of as to induce sleep or increase energy. It is usually consumed orally, in oil sort.

Most nations, including Australia, permit people to drive while on CBD. In NSW, for illustration, it is legal delivered a driver is not ‘impaired’ because of to tiredness and/or decreased blood strain. The current research demonstrates, contraindications apart, that even at the optimum medicinal dose of 1500mg, CBD does not cause impairment.


Nevertheless CBD is frequently regarded ‘non-intoxicating’, its outcomes on protection-sensitive jobs are continue to getting established. Our review is the initial to confirm that, when consumed on its personal, CBD is driver-secure.”


Dr Danielle McCartney, direct writer, University’s Lambert Initiative for Cannabinoid Therapeutics


In contrast to THC, a cannabis part that can induce sedation, euphoria (a ‘high’) and impairment, CBD does not seem to intoxicate people. Alternatively, it has been reported to have calming and pain reduction effects.

Peak concentrations of CBD in a person’s blood plasma are generally attained in three to 4 hours right after having it orally, despite the fact that particular person responses range.

CBD use is increasing in Western nations, with recent College of Sydney research showing that close to 55,000 requests to accessibility medicinal CBD have been approved in Australia considering that 2016. It is most typically prescribed for discomfort, slumber conditions and anxiousness.

About the research

Released in the Journal of Psychopharmacology, the analyze involved 17 participants endeavor simulated driving duties following consuming either a placebo or 15, 300 or 1500 mg of CBD in oil. These amounts symbolize commonly eaten dosages: up to 150mg/working day about the counter and up to 1500mg/day for disorders these types of as epilepsy, suffering, slumber disorders and stress.

Initial, individuals experienced to test to retain a safe distance involving on their own and a direct motor vehicle, and then ‘drive’ alongside highways and rural roadways. They completed the process amongst 45-75 minutes just after using their assigned treatment method, and then once more at in between 3.5 and 4 several hours immediately after, to cover the assortment of plasma concentrations at distinct moments. They recurring this underneath each individual of the four distinct treatment plans (placebo plus a few distinctive doses).

The scientists measured participants’ handle of the simulated automobile, examined by how significantly it weaved or drifted (a standardized evaluate of driving potential), as nicely as their cognitive perform, subjective encounters, and the CBD concentrations in their plasma.

They concluded that no dose of CBD induced emotions of intoxication or appeared to impair either driving or cognitive performance.

“We do, having said that, caution that this study looked at CBD in isolation only, and that drivers having CBD with other drugs really should do so with care,” Dr McCartney mentioned.

A 2020 analyze, also by the University of Sydney, observed incredibly very low doses of vapourised (‘vaped’) CBD – an unheard of technique of using the drug – were being driver-safe.

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