Marijuana and Alcohol Effects on Driving Impairment
(Alc-NHTSA Trial)
Trial Summary
What is the purpose of this trial?
Alcohol and Cannabis (CNB) are two of the most widely used intoxicants. The effects of driving while intoxicated on alcohol are well documented, resulting in numerous drunken driving laws and regulations. As CNB begins to be decriminalized, medical CNB use allowed in multiple U.S. states, and perception of harmfulness falls, CNB use is predicted to rise and it will become increasingly common to publicly encounter persons who recently used the drug. An area of potentially high concern is if ever-greater numbers of CNB users and its legalization will increase the risk of driving while intoxicated from recent CNB use, thereby increasing the risks to public safety. This study aims to examine the combined effects of smoking marijuana and drinking alcohol on simulated driving.
Research Team
Godfrey Pearlson, M.D
Principal Investigator
Founding Director, Olin Neuropsychiatry Center; Yale University
Eligibility Criteria
This trial is for adults who regularly drink alcohol and smoke marijuana, with at least 2 years of cannabis use and driving experience. They must not be novice users, should have used cannabis at least five times in their life without withdrawal symptoms, and hold a valid driver's license.Inclusion Criteria
Exclusion Criteria
Timeline
Screening
Participants are screened for eligibility to participate in the trial
Treatment
Participants receive alcohol and marijuana doses followed by cognitive and simulated driving tests
Follow-up
Participants are monitored for safety and effectiveness after treatment
Treatment Details
Interventions
- Laboratory Evaluations
- Standardized Field Test for Marijuana and Alcohol Impairment
Find a Clinic Near You
Who Is Running the Clinical Trial?
Yale University
Lead Sponsor
National Highway Traffic Safety Administration
Collaborator
National Highway Traffic Safety Administration (NHTSA)
Collaborator
Hartford Hospital
Collaborator
National Institute on Drug Abuse (NIDA)
Collaborator