Increasing the dose of CBD does not change the effects of cannabis, study finds

Linda Rider

New analysis from the Institute of Psychiatry, Psychology & Neuroscience (IoPPN) at King’s University London has observed no evidence that cannabidiol (CBD) decreases the negative outcomes of hashish.

The analysis, printed in Neuropsychopharmacology, troubles the normally held perception that using hashish that is made up of higher degrees of CBD guards the user from psychotic ordeals and memory difficulties, and implies that this really should be thought of by policy makers at present discovering the matter of medicinal and recreational use.

46 healthier volunteers done a randomized and double-blind trial. About the course of four experiments, every participant inhaled hashish vapor that contains 10mg of THC and a differing amount of CBD (0mg, 10mg, 20mg, or 30mg). They then accomplished a collection of responsibilities, questionnaires and interviews built to evaluate the influence on their cognitive skills, severity of psychotic symptoms, and how pleasurable the drug was.

The similar research crew had beforehand identified that pre-emptively having a superior dose of CBD in a capsule a handful of hrs before applying hashish may cut down the adverse effects of THC.

In this analyze, they explored the outcome of altering the CBD:THC ratio in cannabis. Even so, they observed increasing the dose of CBD did not noticeably improve the consequences of THC on cognitive performance, psychotic signs and symptoms or how pleasurable the drug knowledge was.

Dr Amir Englund, a study fellow at King’s IoPPN and the study’s guide author said, “None of the CBD stages analyzed shielded our volunteers from the acute detrimental results of hashish, these kinds of as stress and anxiety, psychotic indicators, and worse cognitive efficiency. It also did not alter the high-quality of the intoxication in any way. The only effect of CBD we saw was that as the focus of CBD amplified, the much more the participants coughed. We requested volunteers to listen to a beloved music on each visit and taste a piece of chocolate. Even though cannabis improved the pleasurability of tunes and chocolate in comparison to when volunteers had been sober, CBD had no affect.”

“THC and CBD are each generated from the similar compound in the hashish plant, so a selection which generates bigger of amounts of CBD will in a natural way be decreased in THC. It might nonetheless be safer for end users to opt for cannabis with larger CBD:THC ratios, but that is because the same sum of cannabis will have much less THC than a decreased CBD:THC variety. General, our tips to individuals seeking to stay clear of the adverse results of THC is to use less of it.”


These conclusions make an vital contribution to the ongoing debate all over the challenges of hashish use. Although CBD on its very own is regarded to have a amount of optimistic consequences in individuals, our facts advise that, at the doses that are typically present in cannabis, it does not protect in opposition to the unfavorable effects of THC. This challenges the usually held watch by numerous hashish customers that cannabis with a increased CBD information supplies a buffer towards the adverse consequences of hashish.”


Professor Philip McGuire, study’s senior creator and previous Head of the Division of Psychosis Experiments at King’s IoPPN


This study was funded by a investigate grant from the Clinical Investigation Council.


Journal reference:

Englund, A., et al. (2022) Does cannabidiol make hashish safer? A randomised, double-blind, cross-around trial of hashish with four diverse CBD:THC ratios. Neuropsychopharmacology.

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