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Completed

NCT Number: NCT05037487

Evaluation of Smoked THC and CBD in Men and Women

The purpose of this study is to determine the pharmacokinetics and pharmacodynamics of inhaled cannabis with varying amounts of delta-9-tetrahydrocannabinol (THC), and cannabidiol (CBD) and to evaluate detection of recently smoked THC in oral fluid.

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Key information

Age range

21 year–55 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 1

Primary location

University of California, Los Angeles

Los Angeles, California, 90095, United States

About this study

This double-blind placebo controlled, within-subject study study will assess testing devices that can measure biochemical markers in oral fluid and neurocognitive-performance markers of recent cannabis use. Other pharmacodynamic effects of inhaled cannabis with CBD and THC will be determined and the pharmacokinetics of THC, CBD, and respective metabolites will be assessed in whole blood.

Who can participate

Healthy volunteers accepted: Yes

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

Inclusion criteria

  • Male or non-pregnant and non-lactating females aged 21-55 years
  • Report weekly-monthly use of cannabis (≤1 day per week) over the past month prior to screening,
  • Not currently seeking treatment for their cannabis use
  • Have a Body Mass Index from 18.5 - 34kg/m2.
  • Able to perform all study procedures
  • Must be using a contraceptive (hormonal or barrier methods)

Exclusion criteria

  • Meeting DSM-V criteria for moderate to severe Cannabis Use disorder (CUD) or any substance use disorder other than nicotine, caffeine
  • Any other Axis I disorder
  • Report using other illicit drugs in the prior 4 weeks, other than cannabis.
  • Current use of any medications that may affect study outcomes
  • If medical history, physical and psychiatric examination, or laboratory tests performed during the screening process are not within the normal range and / or reveal any significant illness (e.g., hypertension) as judged by the study physician and to put the participant at greater risk of experiencing adverse events due to completion of study procedures.
  • Pregnancy is exclusionary due to the possible effects of the study medication on fetal development.
  • History of an allergic reaction or adverse reaction to cannabis is exclusionary.
  • History of respiratory illness or current respiratory illness
  • Currently enrolled in another research protocol
  • Not using a contraceptive method (hormonal or barrier methods)
  • The evaluating physician reviews all medical assessments along with medical history. Any disorders that might make cannabis administration hazardous are exclusionary.

Treatment and study plan

Placebo cannabis

Drug

Smoked placebo cannabis

20 mg CBD Cannabis

Drug

Smoked cannabis with CBD

20 mg CBD + 20 mg THC Cannabis

Drug

Smoked cannabis with CBD and THC

20 mg THC Cannabis

Drug

Smoked cannabis with THC

Primary outcomes

  1. Subjective drug effect ratings of impairment and abuse liability

    Time frame: 6 hours

    Peak subjective ratings of drug effects associated with abuse liability and impairment as measured using visual analogue scales (VAS; 1-100mm).

  2. Pharmacokinetics of THC, CBD and metabolites

    Time frame: 6 hours

    Peak blood levels of THC, CBD, 11-OH-THC, and THCCOOH after exposure (Tmax)

  3. Behavioral task performance as assessed by the DRUID App Score

    Time frame: 6 hour

    Trough composite scores on the DRUID App

  4. THC concentrations in oral fluid

    Time frame: 6 hour

    Peak levels of THC in oral fluid after exposure

Sponsors and collaborators

Lead sponsor

University of California, Los Angeles

Other

Registry information

Official study title

Evaluation of Smoked THC and CBD in Oral Fluid, Pharmacokinetics, and Subjective and Neurocognitive Effects in Men and Women

Acronym: S-TACOFS

Important dates

Study start
2022
Primary completion
2025
Study completion
2025
First posted
Sep 8, 2021
Registry last updated
Mar 20, 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.

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