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.

Dahlgren, Mary Kathryn et al.·Communications medicine·2022·Preliminary EvidencePilot Study
RTHC-03785Pilot StudyPreliminary Evidence2022RETHINKTHC RESEARCH DATABASErethinkthc.com/research

Quick Facts

Study Type
Pilot Study
Evidence
Preliminary Evidence
Sample
N=14

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)
Database ID:
RTHC-03785

Evidence Hierarchy

Meta-Analysis / Systematic Review
Randomized Controlled Trial
Cohort / Case-Control
Cross-Sectional / ObservationalSnapshot without intervening
This study
Case Report / Animal Study

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.

Read More on RethinkTHC

Cite This Study

RTHC-03785·https://rethinkthc.com/research/RTHC-03785

APA

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.