Does Cannabidiol Impair Driving?

Does Cannabidiol Impair Driving?

Driving efficiency was impaired when healthy youths breathed in vaporized marijuana with Δ 9– tetrahydrocannabinol (THC), however not cannabis that was cannabidiol (CBD)- dominant, a small randomized clinical trial suggested.

At 40 to 100 minutes after vaping, the basic variance of lateral position (SDLP)– a step of lane weaving, swerving, and overcorrecting– was increased by THC-dominant marijuana ( 2.33 cm, 95%CI 0.80 -3.86, P PP>P> 0.99), compared to placebo, reported Jan Ramaekers, PhD, of Maastricht University in the Netherlands, and co-authors in JAMA


” Cannabis-induced driving disability differs with marijuana stress, “Ramaekers noted.” Pressures that are rich with THC cause driving problems, but stress which contain CBD and no THC do not,” he informed MedPage Today .” This is important as CBD strains might be recommended for the treatment of medical conditions.” There’s also a popular concept that CBD counteracts THC’s psychoactive impacts, which this research study reveals is not the case, he added.

The findings do not support the conclusion that it’s safe to drive after consuming CBD, stated JAMA associate editors Thomas Cole, MD, MPH, and Richard Saitz, MD, Miles Per Hour, in an accompanying editorial

” Intake of CBD-dominant marijuana did not impair driving in this research study, but the authors acknowledged that the dosages evaluated might not represent common usage and the effect size for CBD-dominant cannabis may not have actually excluded scientifically important impairment,” they wrote.

The study included 26 healthy occasional cannabis users, who checked THC-dominant marijuana (1375 mg of CBD), THC/CBD-equivalent marijuana (13

Medical marijuana and CBD are used in numerous conditions, as a sleep help or to help handle pain and/or symptoms in neurological conditions like Parkinson’s disease

” It’s a low dose certainly, compared to pharmaceutical grade CBD,” Ramaekers said. “In marijuana stress that are currently offered on the free enterprise, the amount of CBD one would take in after a single marijuana cigarette, however, is fairly low; it’s comparable to what was dosed in today study. We concentrated on THC and CBD usage that would mainly show leisure usage of marijuana.”

However the THC dose studied also might not be what’s in a marijuana cigarette. “Cannabis pressures vary substantially in terms of percentage THC,” Ramaekers noted. “In other words, there is no normal marijuana joint.

The crossover trial included four experimental sessions– CBD, THC, THC/CBD, and placebo– scheduled at least 1 week apart. Participants were 23 years old on average and reported using marijuana less than twice a week in the previous year but more than 10 times in their lives.

In each session, participants waited 40 to 100 minutes after vaping, then drove a vehicle over a 100- km highway circuit while maintaining a consistent speed of 95 km/hour (59 mph) and a stable lateral position in the right (slower) traffic lane.

Mean SDLP was computed by summing variances in lateral position over the time of the driving test. Lateral position, the range between the car and the lane boundary to its left, was taped by an electronic camera mounted on the roof of the vehicle. During driving tests, the variety of lateral position worths was approximately 54 cm. At 240 to 300 minutes after vaping, SDLP did not vary considerably for any group compared with placebo ( P=0.20)

” THC-dominant and THC/CBD-equivalent marijuana produced a short-term disability throughout experimental on-road driving, as indexed by a substantial increase in SDLP measured 40 to 100 minutes following vaporization,” the researchers wrote. “In agreement with previous research studies including smoked cannabis or oral THC (dronabinol), this disability was modest in magnitude and similar to that seen in chauffeurs with a 0.05%blood alcohol content (≈ 2.4-2.5 cm).”

” Chauffeurs who consumed THC were usually conscious that their driving suffered, although participants reported that consumption of THC/CBD was related to less anxiety, decreased strength of drug effects, and greater confidence to drive than THC alone,” the editorialists observed. “These findings challenge the myth that CBD ameliorates the psychoactive/psychomotor impacts of THC.”

” Clinicians ought to warn their patients that marijuana products consisting of equal parts CBD and THC are no less impairing than products including THC alone,” Cole and Saitz added. “Additionally, given that alcohol is a significant preventable reason for automobile crash deaths and threat is additive with marijuana, clients need to be advised to prevent any drinking, particularly with cannabis use, prior to driving.”

The research study’s restrictions include its small sample size. Individuals might not be representative of individuals who use medicinal CBD or frequently use leisure cannabis.

Last Updated December 02, 2020

  • Judy George covers neurology and neuroscience news for MedPage Today, blogging about brain aging, Alzheimer’s, dementia, MS, rare diseases, epilepsy, autism, headache, stroke, Parkinson’s, ALS, concussion, CTE, sleep, discomfort, and more. Follow



This research study was moneyed by the Lambert Effort for Cannabinoid Therapeutics at the University of Sydney.

Researchers reported relationships with the Lambert Initiative for Cannabinoid Rehabs, National Health and Medical Research Council of Australia, the Australian Research Council, Kinoxis Rehabs, Janssen, and International Council on Alcohol, Drugs and Traffic Safety.

Editorialists reported relationships with the NIH, the National Institute on Alcohol Abuse and Alcohol Addiction, the National Institute on Drug Abuse, Philadelphia College of Osteopathic Medication, Burroughs Wellcome Fund, Alkermes, American Society of Addiction Medicine, American Medical Association, National Council on Behavioral Health Care, Kaiser Permanente, UpToDate/Wolters Kluwer, Yale University, National Committee on Quality Assurance, University of Oregon, Oregon Health and Science University, RAND Corporation, Leed Management Consulting/Harvard Medical School, Partners, Beth Israel Deaconess Medical Facility, American Academy of Dependency Psychiatry, Group Health Cooperative, Smart Recovery, Institute for Research and Training in the Addictions, Charles University in Prague, Brandeis University, Massachusetts Medical Society, International Network on Brief Interventions for Alcohol and Other Drugs, Karolinska Institutet, and ABT Corporation.

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