Open-label trial finds full-spectrum CBD reduced anxiety significantly within one week, with cognitive improvements
In 14 patients with moderate-to-severe anxiety, four weeks of a full-spectrum high-CBD sublingual solution reduced anxiety by week 1 in most patients and also improved executive function, mood, sleep, and quality of life.
Quick Facts
What This Study Found
Anxiety scores decreased significantly by week 4 (BAI: p<0.001; OASIS: p<0.001). Clinically significant treatment response (≥15% symptom reduction) was achieved by week 1 in 78.6-92.7% of patients and reached 100% by week 3. Secondary outcomes including mood, sleep, quality of life, and executive function also improved. The study drug was well-tolerated with minor side effects (sleepiness, increased energy, dry mouth).
Key Numbers
14 patients; ~30 mg/day CBD; BAI and OASIS both p<0.001 at week 4. Response by week 1: 78.6% (BAI), 92.7% (OASIS). 100% responded by week 3. No serious adverse events. No intoxication reported.
How They Did This
Open-label stage of clinical trial NCT02548559. 14 outpatients with moderate-to-severe anxiety (BAI ≥16 or OASIS ≥11) received 1 mL t.i.d. of a full-spectrum high-CBD sublingual solution (9.97 mg/mL CBD, 0.23 mg/mL THC) for 4 weeks. Autoregressive linear modeling assessed outcomes.
Why This Research Matters
This is one of the first clinical trials to examine cognitive outcomes alongside anxiety outcomes with a CBD product, and the finding that executive function improved (rather than deteriorated) addresses a key safety concern.
The Bigger Picture
The rapid onset of anxiety reduction (within one week) and improvement in cognitive function distinguish this full-spectrum CBD product from both traditional anxiolytics (which may take weeks) and THC-containing products (which may impair cognition).
What This Study Doesn't Tell Us
Open-label design without placebo control. Very small sample (n=14). Short duration (4 weeks). Full-spectrum product contains trace THC and other compounds. Cannot attribute effects to CBD alone. Double-blind stage ongoing.
Questions This Raises
- ?Will the double-blind stage confirm these open-label findings?
- ?Is the trace THC contributing to the effect?
- ?Would CBD isolate produce the same rapid response?
- ?How does this compare to standard anxiolytics?
Trust & Context
- Key Stat:
- 93% responded by week 1; 100% by week 3 with no serious side effects
- Evidence Grade:
- Open-label pilot data only. Promising but awaiting double-blind confirmation.
- Study Age:
- Published in 2022.
- Original Title:
- Clinical and cognitive improvement following full-spectrum, high-cannabidiol treatment for anxiety: open-label data from a two-stage, phase 2 clinical trial.
- Published In:
- Communications medicine, 2(1), 139 (2022)
- Authors:
- Dahlgren, Mary Kathryn(3), Lambros, Ashley M(5), Smith, Rosemary T(6), Sagar, Kelly A, El-Abboud, Celine, Gruber, Staci A
- Database ID:
- RTHC-03785
Evidence Hierarchy
A small preliminary study to test whether a larger study is feasible.
What do these levels mean? →Frequently Asked Questions
How quickly does CBD work for anxiety?
In this open-label trial, most patients (79-93%) achieved clinically significant anxiety reduction within the first week of treatment with a full-spectrum CBD product, and 100% responded by week 3.
Does CBD affect thinking and memory?
In this study, executive function (a measure of higher-order thinking) actually improved with CBD treatment, contrasting with concerns about cognitive impairment from cannabis products.
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Cite This Study
https://rethinkthc.com/research/RTHC-03785APA
Dahlgren, Mary Kathryn; Lambros, Ashley M; Smith, Rosemary T; Sagar, Kelly A; El-Abboud, Celine; Gruber, Staci A. (2022). Clinical and cognitive improvement following full-spectrum, high-cannabidiol treatment for anxiety: open-label data from a two-stage, phase 2 clinical trial.. Communications medicine, 2(1), 139. https://doi.org/10.1038/s43856-022-00202-8
MLA
Dahlgren, Mary Kathryn, et al. "Clinical and cognitive improvement following full-spectrum, high-cannabidiol treatment for anxiety: open-label data from a two-stage, phase 2 clinical trial.." Communications medicine, 2022. https://doi.org/10.1038/s43856-022-00202-8
RethinkTHC
RethinkTHC Research Database. "Clinical and cognitive improvement following full-spectrum, ..." RTHC-03785. Retrieved from https://rethinkthc.com/research/dahlgren-2022-clinical-and-cognitive-improvement
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.