Skip to main content
OpenTrials
Recruiting

NCT Number: NCT06115603

The Effects of Cannabigerol on Attention-Deficit/Hyperactivity Disorder

The goal of this clinical trial is to evaluate the effects of Cannabigerol (CBG) on indicators of Attention-Deficit/Hyperactivity Disorder (ADHD) in a sample of participants indicating/reporting symptoms associated with ADHD. The main question it aims to answer is: Does CBG reduce ADHD-related indicators relative to placebo? Participants will administer an acute dose of placebo or 80mg CBG and complete outcome measures at 45 minutes and 75 minutes. Daily surveys to monitor safety will be administered for one week following administration.

Recruiting

Interested in participating?

Request Info

Key information

Conditions

Attention-Deficit/Hyperactivity Disorder Attention Deficit Disorder with Hyperactivity Attention Deficit and Disruptive Behavior Disorders Mental Disorders Neurodevelopmental Disorders

Age range

18 year–55 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 2

Primary location

University of Arkansas

Fayetteville, Arkansas, 72703, United States

Location status: Recruiting

Location contact

Ellen Leen-Feldner, PhD

CONTACT

[email protected]

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

  • Between 18 and 55-years-old.
  • BMI between 18 and 35 kg/m2.
  • Score a 4 or above on the Adult ADHD Self-Report Scale (ASRS-v1.1) Symptom Checklist Part A.
  • Meet diagnostic criteria for ADHD with a current severity rating of at least mild as defined by the DIAMOND.
  • Are not pregnant or currently breastfeeding.
  • Have no history of significant allergic condition, hypersensitivity, or allergic reactions to cannabis, cannabinoid medications, hemp products, medium chain triglyceride oil, or peppermint.
  • Have not used CBG or any other cannabinoid products in the past 30 days.
  • Willing to abstain from using cannabis or any THC-containing product for the duration of the study.
  • Have never used a synthetic cannabinoid or cannabinoid analogue (e.g., dronabinol, nabilone), or a synthetic cannabinoid receptor agonist (e.g., spice, k2).
  • Have not been exposed to any investigational drug or device 30 days prior to screening and you have no plans to take an investigational drug during the study.
  • Willing to maintain a stable treatment regimen (i.e., no change in current medication use) for the duration of the study.
  • Not currently taking a prescription medication for ADHD and have not been prescribed a medication for ADHD in the past six months.
  • Not currently having thoughts of committing suicide
  • Does not meet criteria for current severe major depressive disorder or a substance use disorder.
  • Have not been diagnosed with bipolar disorder or psychosis.
  • Do not have an acute illness, such as a respiratory infection or other illness that would interfere with study participation; not currently taking medication for an acute illness (e.g., antibiotic).
  • Do not have history of diagnosis related to liver function and/or significantly impaired liver function (e.g., cirrhosis of the liver, hepatitis).
  • Willing to ensure they have used effective contraception (for example, oral contraception, double barrier, intra-uterine device) for 30 prior to the study and for 30 days after study completion.
  • Have access to a ride to the University of Arkansas campus for research appointments.
  • Willing to comply with current university mandates as they pertain to COVID-19 protocols (e.g., mask wearing).
  • Do not have any serious or unstable physical health conditions including neurological or renal illness.
  • Do not have any current or historical cardiovascular conditions, including hypotension, bradycardia, or heart block.
  • No atrial fibrillation, bradycardia, or tachycardia detected via mobile electrocardiogram during the in-laboratory visit.
  • No recent illicit drug use other than cannabis, or alcohol use in the 12 hours preceding the in-laboratory visit.
  • Not currently prescribed or taking the following medications:
  • Warfarin
  • Clobazam
  • Valproic acid
  • Phenobarbital
  • Mechanistic Target of Rapamycin [mTOR] Inhibitors
  • Oral tacrolimus
  • St. John's wort
  • Epidiolex
  • Escitalopram
  • Cardiovascular medications
  • Strong CYP3A4 inhibitors (e.g., ketoconazole)

Treatment and study plan

Cannabigerol

Drug

1 mL of 80mg Cannabigerol once during experimental session

Placebo

Other

1 mL of placebo once during experimental session

Primary outcomes

  1. Sustained Attention to Response Task

    Time frame: 75 minutes post CBG/placebo administration

    A computerized task that measures response inhibition.

  2. Trail Making Test-Parts A and B (TMT-A&B)

    Time frame: 75 minutes post CBG/placebo administration

    A paper-and-pencil task that measures

  3. Digit Symbol Substitution Test (DSST)

    Time frame: 75 minutes post CBG/placebo administration

    A paper-and-pencil task that measures attention/processing speed.

  4. Rey Auditory Verbal Learning Test (AVLT)

    Time frame: 75 minutes post CBG/placebo administration

    A paper-and-pencil/verbal test that measures verbal memory.

  5. Iowa Gambling Task (IGT)

    Time frame: 75 minutes post CBG/placebo administration

    A computerized task that measures decision making (an indicator of impulsivity/hyperactivity).

Secondary outcomes

  1. Positive and Negative Affect Scale-Expanded Version

    Time frame: Baseline, 45 minutes post CBG/placebo administration, 75 minutes post CBG/placebo administration

    Self-report measure of positive and negative affect. Scores range from 30-150 on each of the two types of affects, with higher scores representing greater affect.

  2. Karolinska Sleepiness Scale

    Time frame: Pre CBG/placebo administration, 75 minutes post CBG/placebo administration

    Self-report measure of subjective level of sleepiness at a particular time during the day. Scores range from 1-10, with higher scores representing greater sleepiness.

  3. Brief Irritability Test

    Time frame: Pre CBG/placebo administration, 75 minutes post CBG/placebo administration

    Self-report measure of irritability. Scores range from 5-30, with higher scores representing greater irritability.

  4. Numeric Rating Scale (pain)

    Time frame: Pre CBG/placebo administration, 75 minutes post CBG/placebo administration

    Self-report measure of subjective level of pain. Scores range from 0-10, with higher scores representing greater pain.

  5. State-Trait Anxiety Inventory (State Version)

    Time frame: Pre CBG/placebo administration, 75 minutes post CBG/placebo administration

    Self-report measure of state anxiety. Scores range from 20 to 80 with higher scores indicating greater anxiety.

  6. Visual Analog Scales

    Time frame: 75 minutes post CBG/placebo administration

    Self-report of state-like states (e.g., anxiety, hunger). This scale ranges from 0 to 100 with higher scores indicating higher levels of the indication.

  7. Global Impression of Change

    Time frame: 75 minutes post CBG/placebo administration

    Self-report measure of perceived change in ADHD symptoms. This scale ranges from 1 to 7 with higher scores indicating greater improvements.

Study contacts

Contact information is provided by the study sponsor or research team.

Ellen W Leen-Feldner, PhD

CONTACT

[email protected]

4795754256

Sponsors and collaborators

Lead sponsor

University of Arkansas, Fayetteville

Other

Registry information

Official study title

CBG and Attention: A Double-Blind, Randomized, Placebo-Controlled Trial Examining the Effects of Cannabigerol on Indicators of Attention-Deficit/Hyperactivity Disorder

Acronym: CBG

Important dates

Study start
2024
Primary completion
2026
Study completion
2026
First posted
Nov 3, 2023
Registry last updated
May 27, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Related clinical trials

Published trials that share one or more normalized conditions with this study.