Antidepressants may be less effective in adolescents who regularly use cannabis
A narrative review concluded that antidepressants are likely less effective for adolescents with depression or anxiety who frequently use cannabis, based on overlapping and potentially competing mechanisms of action.
Quick Facts
What This Study Found
Almost all randomized clinical trials of antidepressants excluded participants using cannabis or other drugs, so the expected course of therapy in cannabis users is unknown. Based on shared neurochemical pathways (serotonin, endocannabinoid, and other systems), the authors concluded it is reasonable to assume antidepressants are less effective in adolescents who use cannabis frequently.
Key Numbers
No specific numerical outcomes reported. The review identified overlapping neurochemical pathways between antidepressants (targeting serotonin, norepinephrine) and cannabinoids (THC and CBD effects on endocannabinoid system).
How They Did This
Narrative literature review examining the mechanisms of action of antidepressants and cannabis, focusing on neurochemical overlaps and potential interactions relevant to adolescent treatment outcomes.
Why This Research Matters
Depression and anxiety are rising in adolescents, antidepressant prescriptions are increasing, and cannabis is the most commonly used illicit substance in this age group. Yet virtually no clinical trial has studied what happens when these are combined.
The Bigger Picture
This represents a major blind spot in psychiatric treatment. Millions of adolescents take antidepressants, many also use cannabis, yet the interaction between these has essentially never been studied in a clinical trial.
What This Study Doesn't Tell Us
Narrative review based on mechanistic reasoning rather than clinical outcome data. The conclusion that antidepressants are "less effective" is an inference, not an established finding from head-to-head studies.
Questions This Raises
- ?Should clinical trials of antidepressants in adolescents include cannabis users as a subgroup?
- ?Could CBD specifically interfere with or enhance antidepressant mechanisms?
Trust & Context
- Key Stat:
- Nearly all antidepressant trials excluded cannabis users
- Evidence Grade:
- Narrative review based on mechanistic reasoning from pharmacology, without direct clinical evidence of the proposed interaction.
- Study Age:
- Published in 2022.
- Original Title:
- Examining the Use of Antidepressants for Adolescents with Depression/Anxiety Who Regularly Use Cannabis: A Narrative Review.
- Published In:
- International journal of environmental research and public health, 19(1) (2022)
- Authors:
- Hen-Shoval, Danielle(3), Weller, Aron(3), Weizman, Abraham(7), Shoval, Gal
- Database ID:
- RTHC-03908
Evidence Hierarchy
Summarizes existing research without a strict systematic method.
What do these levels mean? →Frequently Asked Questions
Does cannabis make antidepressants less effective?
No clinical trial has directly tested this, but this review argues it is likely based on overlapping neurochemical pathways between antidepressants and cannabinoids. The interaction remains unstudied in practice.
Have antidepressants been tested in teens who use cannabis?
Almost no randomized clinical trials of antidepressants included participants who used cannabis or other drugs, creating a major gap in knowledge about real-world treatment effectiveness.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-03908APA
Hen-Shoval, Danielle; Weller, Aron; Weizman, Abraham; Shoval, Gal. (2022). Examining the Use of Antidepressants for Adolescents with Depression/Anxiety Who Regularly Use Cannabis: A Narrative Review.. International journal of environmental research and public health, 19(1). https://doi.org/10.3390/ijerph19010523
MLA
Hen-Shoval, Danielle, et al. "Examining the Use of Antidepressants for Adolescents with Depression/Anxiety Who Regularly Use Cannabis: A Narrative Review.." International journal of environmental research and public health, 2022. https://doi.org/10.3390/ijerph19010523
RethinkTHC
RethinkTHC Research Database. "Examining the Use of Antidepressants for Adolescents with De..." RTHC-03908. Retrieved from https://rethinkthc.com/research/hen-shoval-2022-examining-the-use-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.