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Driving BehaviorPhase 1PDIDNCT04970342

Validation of the Drug Impaired Driving Scenario (DIDS) on the CRCDS-miniSim

A Phase 1 study testing 0.75 mg Alprazolam Capsule, Cannabis (6.18% THC / <0.025% CBD) and Cannabis (0%/ THC / 0% CBD) in people with Driving Behavior and Driving Under the Influence, run by Timothy L. Brown at 1 site in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

Subjects will participate in a 4-visit study protocol at the National Advanced Driving Simulator, part of the University of Iowa, in which they will be asked to complete assorted questionnaires, computerized cognitive tasks, and a simulator drive. Read more about this study

Who is it for?
Ages 19 to 45 yearsHealthy volunteers can take part
Conditions the study is for
Driving Behavior, Driving Under the Influence
What is being tested?
0.75 mg Alprazolam Capsule, Cannabis (6.18% THC / <0.025% CBD) and Cannabis (0%/ THC / 0% CBD)
Type of treatment
Pill or oral medicine
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
13 participants
Where
1 siteUnited States
Study dates
16 Jul 2021to 21 Aug 2021
Phase
Phase 1
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 19 to 45 years
  • All sexes
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • Understands and provides written informed consent prior to the initiation of any protocol-specific procedures.
  • Able to comprehend and willing to comply with the requirements of the protocol.
  • Healthy male or female adult, 19 to 45 years of age, inclusive, at Screening.
  • Regular sleep pattern (usual bedtime between 21:00 and 00:00).
  • Score <10 on Epworth Sleepiness Scale at Screening.
  • Able to reliably perform study assessments at Screening (On practice scenario, SDLP no higher than 1 standard deviation greater than the mean for normal healthy adults completing the practice scenario and subject has 7 or more correct hits on the Divided Attention task; CogScreen SDC Correct no less than 1 standard deviation below the mean for healthy adults); demonstrates the ability to understand task instructions at Screening; and is physically (e.g., adequate manual dexterity, vision, and hearing) and cognitively capable of performing study tasks at Screening.
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  • Possesses (and is willing to provide) a valid driver's license and is an active driver.
  • Determined to be (by self-report) an active cannabis user with use of at least once per month over the preceding 90 days.
  • Willing to abstain from cannabis use (other than study drug) beginning at the end of Screening until discharge from NADS on Day 2 of Treatment Period 3.
  • Female subjects must meet one of the following criteria: 1) If of childbearing potential, female subjects agree to use two contraceptive regimens or remain abstinent during the study; or 2) if of non-childbearing potential, female subjects should be surgically sterile or in a menopausal state.

Who cannot join

  • A significant history and/or presence of hepatic, renal, cardiovascular, pulmonary, neurological, psychiatric, gastrointestinal, hematological, immunologic, ophthalmologic, metabolic, or oncological disease, or any other medical issue that would, in the opinion of the Investigator, present undue risk for the subject in the study.
  • A history of suicidal behavior within 24 months of Screening, has answered YES to questions 3, 4, or 5 on the C-SSRS at Screening or at any clinic admission, or is currently at risk of suicide in the opinion of an Investigator.
  • A recent history (within 6 months prior to Screening) of substance use disorder (including alcohol) (as judged by the Investigator) or regularly consumes >2 alcoholic drinks/day during the last 3 months prior to Screening (1 alcoholic drink is approximately equivalent to: beer [284 mL], wine [125 mL/4 ounces], or distilled spirits [25 mL/1 ounce]). Subjects who consume 3 drinks per day but less than 14 drinks per week may be enrolled at the discretion of the Investigator.
  • Demonstrates simulator sickness questionnaire scores which are indicative of simulator sickness as defined in the driving simulation operations manual.
  • Regularly consumes excessive amounts of caffeine, defined as greater than 6 servings of coffee, tea, cola, or other caffeinated beverages per day.
  • Smokes more than 10 cigarettes or e-cigarettes, or 3 cigars or pipes per day, or is unable to refrain from smoking during study visits.
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  • Has been exposed to an investigational drug or device within the 30 days, or 5 half lives (if known), whichever is longer, prior to Screening.
  • Has used a prescription or over-the-counter medication known to cause sedation within 7 days prior to Admission for Period 1 and is unwilling or unable to refrain from sedating medication use during study participation.
  • Has used any benzodiazepine, barbiturate, or GABAA modulator (e.g., eszopiclone, zopiclone, zaleplon, and zolpidem) within 28 days prior to Admission for Period 1 or is unwilling or unable to refrain from medication use during study participation.
  • Has a history of hepatitis B surface antigen, hepatitis C antibodies, or human immunodeficiency virus (HIV) antibodies 1 or 2.
  • Is pregnant or breastfeeding at Screening or any clinic admission or will attempt to become pregnant at any time during study participation.
  • Has a clinically significant abnormal finding on 6-lead electrocardiogram (ECG) at Screening or at any clinic admission. The ECG may be repeated once for confirmatory purposes if initial values obtained exceed the limits specified.
  • Has a positive urine test for drugs of abuse (other than tetrahydrocannabinol (THC)) or Breath Alcohol Concentration (BrAC) > 0.0 at Screening or any admission.
  • Has any clinically significant abnormal physical examination finding at Screening or any clinic admission.
  • Participates in night shift work.
  • Has traveled across ≥1 time zone in the 2 weeks prior to Admission for Period 1 or is expected to travel across ≥1 time zone during the study.
  • Is investigative site personnel or their immediate families (spouse, parent, child, or sibling whether biological or legally adopted).

Trial locations and contacts

1 site in 1 country.

United States1 site
  • National Advanced Driving Simulator

    Iowa City, Iowa, 52242

Other trials in United States

About this study

Official title: Validation of the Drug Impaired Driving Scenario (DIDS) on the CRCDS-miniSim: Evaluating Sensitivity to the Effects of Cannabis and Alprazolam

Subjects will participate in a 4-visit study protocol at the National Advanced Driving Simulator, part of the University of Iowa, in which they will be asked to complete assorted questionnaires, computerized cognitive tasks, and a simulator drive. Subjects will be administered 0.75 mg alprazolam (Xanax) or placebo and 500 mg vaporized cannabis (6.18% THC / <0.025% CBD) or placebo (0% THC / 0% CBD).

The primary objective of this study is to validate the Drug Impaired Driving Scenario (DIDS) using the CRCDS-2 driving simulator by assessing the acute effects of cannabis relative to placebo on simulated driving performance. Assay sensitivity will be demonstrated by the significant effect of 0.75 mg alprazolam (active comparator) on driving and cognitive endpoints.

Read the detailed description

At the University of Iowa's National Advanced Driving Simulator (NADS), normal healthy subjects who currently use cannabis recreationally (at least once a month) will be recruited. The study involves four visits, the first of which is a screening visit of approximately 3 hours. At the screening visit, consent is obtained, questionnaires are given, and a physical and psychological exam is administered. Subjects will also train on study procedures, such as the cognitive testing, the simulator drive, and the cannabis inhalation procedure. Subjects will then be scheduled for their three treatment visits, which will be one week apart..

The treatment visits will have a clean (double placebo) and two treatment visits (active alprazolam and placebo cannabis, placebo alprazolam and active cannabis). The alprazolam dose is 0.75 mg and the cannabis dose is 500 mg. All cannabis will be inhaled via a Volcano® Digit vaporizer using the Foltin Puff Procedure. Each of the treatment visits will last approximately twenty-three hours and will include intake with eligibility and baseline testing, transport to a local hotel, an overnight stay at the hotel, transport to NADS, being dosed with study drugs or placebos, cognitive assessments, a simulator drive, and assorted questionnaires. There will also be 8 mL blood sampling before dosing, before driving, and after driving. Each randomized subject will complete a treatment visit of each type one week apart in a counterbalanced sequence.

Meals will be provided at the treatment visits (dinner, snack, breakfast, lunch). Subjects will be monitored until the drug effects have subsided sufficiently to ensure it is safe to transport them home. Subjects will need to arrange their own transportation; they will not be permitted to drive themselves home after the treatment visits.

Being tested
Placebo (Lactose) Capsule, 0.75 mg Alprazolam Capsule, Cannabis (6.18% THC / <0.025% CBD), Cannabis (0%/ THC / 0% CBD)
Keywords
Driving, Cannabis, Xanax, Marijuana, Alprazolam, Driving Impairment, Substance Use, SDLP, CogScreen, CRCDS
Medical subject headings
Driving Under the Influence, Marijuana Abuse, Substance-Related Disorders

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Placebo (Lactose) CapsuleDrug

    Also called Placebo, Placebo Alprazolam

    Single dose on two of the three study visits, orally administered 40 minutes prior to cannabis dose

  • 0.75 mg Alprazolam CapsuleDrug

    Also called Xanax, Active Alprazolam, Active Xanax

    Single dose on one of the three study visits, orally administered 40 minutes prior to cannabis dose

  • Cannabis (6.18% THC / <0.025% CBD)Drug

    Also called Marijuana, Marihuana, Active Cannabis

    Cannabis vapor is produced from 500 mg of dried plant material (6.18% THC / <0.025% CBD). Subjects will inhale using the Foltin Puff Procedure over 10 minutes. Single inflated bag/dose consumed via inhalation 40 minutes after alprazolam dose on one of the three study visits.

  • Cannabis (0%/ THC / 0% CBD)Drug

    Also called Marijuana, Marihuana, Placebo Cannabis, Placebo

    Cannabis vapor is produced from 500 mg of dried plant material (0% THC / 0% CBD). Subjects will inhale using the Foltin Puff Procedure over 10 minutes. Single inflated bag/dose consumed via inhalation 40 minutes after alprazolam dose at two of the three study visits.

Study groups in NCT04970342
Study groupRoleWhat they receive
"Sober" or Double PlaceboExperimentalSubject receives alprazolam capsule containing placebo (lactose). Subject receives placebo cannabis (0% THC / 0% CBD).
Receives: Drug: Placebo (Lactose) Capsule; Drug: Cannabis (0%/ THC / 0% CBD)
Active Alprazolam (Xanax), Placebo CannabisExperimentalSubject receives active 0.75 mg alprazolam capsule. Subject receives placebo cannabis (0% THC / 0% CBD).
Receives: Drug: 0.75 mg Alprazolam Capsule; Drug: Cannabis (0%/ THC / 0% CBD)
Placebo Alprazolam (Xanax), Active CannabisExperimentalSubject receives alprazolam capsule containing placebo (lactose). Subject receives active cannabis (6.18% THC / <0.025% CBD).
Receives: Drug: Placebo (Lactose) Capsule; Drug: Cannabis (6.18% THC / <0.025% CBD)

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Standard Deviation of Lateral Position (SDLP)

    The ability to keep the vehicle straight in the lane. Data is presented from the a rural drive with a concurrent divided attention task.

    Measured: over one hour during the course of the simulator drive conducted 45 minutes post-dose at Treatment Visit 1, 2, and 3

Secondary outcomes (1)
  1. Lane Exceedences

    Count of the number of times the simulated vehicle leaves the driving lane, will be compared across treatments. Data is from a rural drive with a concurrent divided attention task.

    Measured: over one hour during the course of the simulator drive conducted 45 minutes post-dose at Treatment Visit 1, 2, and 3

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted21 Jul 2021
  2. Study start16 Jul 2021
  3. Primary completion21 Aug 2021
  4. Study completion21 Aug 2021

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Basic science
Allocation
Randomised
Intervention model
Crossover
Model description
The study uses two treatments - alprazolam and cannabis - and placebo. Subjects are randomized to a study sequence where the order of treatments (study arm) is counter-balanced, but all treatments and placebo are received by all subjects. At a visit, you might receive placebo alprazolam and placebo cannabis, placebo alprazolam and active cannabis, or active alprazolam and placebo cannabis. There is not a visit where you receive both active alprazolam and active cannabis.
Masking
Triple blind
Who is masked
Participant, Investigator, Outcomes assessor
Enrolment
13 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT04970342
Sponsor's protocol ID
202105389
Acronym
PDID
Status last verified
Aug 2022
First submitted
24 Jun 2021
Last updated
25 Jul 2023
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No: Data is being collected to support regulatory efforts by the government and data will not be available to those outside of the research team and government at this time.

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing 0.75 mg Alprazolam Capsule, Cannabis (6.18% THC / <0.025% CBD) and Cannabis (0%/ THC / 0% CBD) in people with Driving Behavior and Driving Under the Influence, run by Timothy L. Brown at 1 site in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 10 inclusion and 17 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 25 Jul 2023. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 25 Jul 2023). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Standard Deviation of Lateral Position (SDLP) (time frame: over one hour during the course of the simulator drive conducted 45 minutes post-dose at Treatment Visit 1, 2, and 3). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 25 Jul 2023.

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