High doses of medical cannabis have no effect on driving

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Very high doses of medical cannabis have no effect on driving, according to a new study. Researchers in Australia found that 1,500mgs of cannabidiol (CBD) – the highest daily medicinal dose available there – has “no impact” on people’s driving or cognitive abilities.

CBD is a component of cannabis that many people around the world use to improve their sleep and energy levels. It is often consumed orally, in oil form, but it can also come in gummy bears, chocolate and even beer.

In the UK it is classified as a food supplement as it is illegal to market the substance as a health product and is not available on the NHS. Many countries, including the UK, do allow people to drive on CBD as it is not psychoactive and contains less than 0.1% THC which is the substance that gets people high when they smoke cannabis.

Sleep experts in the US recommend that anyone weighing up to 70kg should take between 10-60mg per day. The present study shows that even a high dose of 1,500mg does not cause impairment.

Lead author Dr. Danielle McCartney, of the University of Sydney said: “Though CBD is generally considered non-intoxicating, its effects on safety-sensitive tasks are still being established. Our study is the first to confirm that, when consumed on its own, CBD is driver-safe.”

Unlike THC which can induce sedation, euphoria and impairment, CBD does not appear to intoxicate people and it has been reported to have calming and pain relief effects. Peak concentrations of CBD in a person’s blood plasma are usually attained within three to four hours after taking it orally, although individual responses vary.

CBD use is increasing across Western nations and other University of Sydney research shows that around 55,000 requests to access medicinal CBD have been approved in Australia since 2016. It is mostly prescribed for pain, sleep disorders and anxiety.

The study, published in the Journal of Psychopharmacology, involved 17 participants doing simulated driving tasks after taking a placebo or 15, 30 or 1,500mg of CBD oil. These amounts represent frequently consumed doses available in Australia: up to 150mg per day over the counter and up to 1,500mg per day for conditions such as epilepsy, pain, sleep disorders and anxiety.


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