Overview of psychiatric effects of cannabinoids from acute use to chronic exposure and withdrawal
A comprehensive commentary found that cannabinoids produce dose-dependent effects on anxiety, mood, and cognition acutely, while chronic use increases risk of tolerance, dependence, withdrawal, and associations with anxiety, psychotic, and mood disorders.
Quick Facts
What This Study Found
This overview examined the psychiatric effects of both plant-based and synthetic cannabinoids across different timeframes.
Acutely, cannabinoids produce multiphasic, dose-dependent effects on anxiety, mood, and perception while impairing cognition and psychomotor function. In healthy individuals, these acute negative effects tend to be milder compared to people with pre-existing psychiatric conditions.
With chronic exposure, the probability of developing tolerance and dependence increases. A problematic pattern of use can lead to clinically significant impairment, and cessation in tolerant, dependent individuals produces a withdrawal syndrome.
Long-term cannabis exposure has been linked to anxiety, psychotic, and mood disorders in the research literature. The authors noted that even with limitations in existing evidence, the plausibility of a causal relationship and the potential for long-term brain changes from regular exposure, especially in adolescents, warrant clinical attention.
Key Numbers
Effects are dose-dependent and multiphasic. Chronic use increases probability of tolerance, dependence, and withdrawal. Acute effects milder in healthy individuals vs. those with pre-existing psychiatric conditions.
How They Did This
Commentary and overview synthesizing published literature on acute, chronic, and withdrawal-related psychiatric effects of plant-based and synthetic cannabinoids, with discussion of clinical implications.
Why This Research Matters
With rising cannabis use rates and expanding legalization, clinicians and the public need a clear picture of the full spectrum of psychiatric effects, from single-use experiences through chronic exposure to withdrawal.
The Bigger Picture
This overview frames cannabis psychiatric effects as existing on a spectrum from acute to chronic, with different risk profiles for different populations. The emphasis on adolescent vulnerability and pre-existing psychiatric conditions highlights that cannabis effects are not uniform across all users.
What This Study Doesn't Tell Us
This is a commentary synthesizing existing literature rather than conducting new analysis. The authors acknowledge limitations in the existing evidence base. The review does not quantify absolute risk levels or differentiate effects by specific cannabinoid profiles, doses, or routes of administration.
Questions This Raises
- ?How do psychiatric risks differ across specific cannabinoid profiles (high-THC vs. balanced THC:CBD)?
- ?What screening tools should clinicians use for patients who use cannabis?
- ?How has legalization affected psychiatric presentations in emergency settings?
Trust & Context
- Key Stat:
- Chronic cannabinoid exposure increases probability of tolerance, dependence, and withdrawal
- Evidence Grade:
- This is a comprehensive commentary drawing on established literature, providing moderate-level evidence as an overview of the field rather than a systematic analysis.
- Study Age:
- Published in 2018. Cannabis potency and use patterns have continued to evolve since publication.
- Original Title:
- The Psychiatric Consequences of Cannabinoids.
- Published In:
- Clinical therapeutics, 40(9), 1448-1456 (2018)
- Authors:
- De Aquino, Joao P(12), Sherif, Mohamed, Radhakrishnan, Rajiv(8), Cahill, John D, Ranganathan, Mohini, D'Souza, Deepak C
- Database ID:
- RTHC-01638
Evidence Hierarchy
Summarizes existing research on a topic.
What do these levels mean? →Frequently Asked Questions
Are the psychiatric effects the same for everyone?
No. The review found that acute negative effects tend to be milder in healthy individuals compared to those with pre-existing psychiatric disorders. Adolescents may be particularly vulnerable to long-term effects.
Does cannabis use always lead to dependence?
No. The review states that chronic exposure increases the probability of tolerance and dependence, but not all chronic users develop problematic patterns. A subset develops clinically significant impairment and withdrawal upon cessation.
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Cite This Study
https://rethinkthc.com/research/RTHC-01638APA
De Aquino, Joao P; Sherif, Mohamed; Radhakrishnan, Rajiv; Cahill, John D; Ranganathan, Mohini; D'Souza, Deepak C. (2018). The Psychiatric Consequences of Cannabinoids.. Clinical therapeutics, 40(9), 1448-1456. https://doi.org/10.1016/j.clinthera.2018.03.013
MLA
De Aquino, Joao P, et al. "The Psychiatric Consequences of Cannabinoids.." Clinical therapeutics, 2018. https://doi.org/10.1016/j.clinthera.2018.03.013
RethinkTHC
RethinkTHC Research Database. "The Psychiatric Consequences of Cannabinoids." RTHC-01638. Retrieved from https://rethinkthc.com/research/de-2018-the-psychiatric-consequences-of
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.