THC + CBD and Memory Study

Hartford Hospital

Status and phase: Begins enrollment in 6 months; Early Phase 1

Conditions: Marijuana Use; Cannabis Intoxication; Cannabis Use

Treatments: Drug: High THC/High CBD Marihuana; Drug: High THC/No CBD Marihuana; Drug: No THC/No CBD Marihuana

Study type: Interventional

Funder types: Other

Identifiers

NCT04855526

126663 (Other Grant/Funding Number)

R-HHC-2019-0137

Details and patient eligibility

About

Memory deficits are one of the most consistently observed cognitive effects of marijuana use. There is evidence that some decrements attributable to the primary psychoactive ingredient, delta-9-tetrahydrocannabinol (THC), may be attenuated by cannabidiol (CBD). This study will help us learn more about the relationship between THC and CBD consumption with memory processes. A combination of MRI and neuropsychological tests (which are computer and paper/pencil tasks) will be used to measure the neurocognitive and behavioral impacts of THC and CBD use.

Full description

With increased legalization and medicalization of marijuana (MJ), there is an urgent need to understand the acute effects of use. One of the most consistently observed cognitive outcomes associated with MJ use is memory dysfunction, which may have a substantial impact on daily life in individuals using MJ for recreational or medicinal purposes. Notably, there are numerous preparations of MJ with varying proportions of cannabinoids, which may differ in behavioral and cognitive effects. For instance, there is emerging evidence that acute administration of delta-9-tetrahydrocannabinol (THC), the main psychoactive constituent of MJ, hinders memory and reduces prefrontal and hippocampal functional magnetic resonance imaging (fMRI) activation, but cannabidiol (CBD) may mitigate some of these impairments. Given the role of glutamate in learning and memory, the investigators suggest that these effects may be subserved, in part, by glutamatergic mechanisms. The investigators will use magnetic resonance spectroscopy (MRS) to non-invasively measure glutamate in order to explore the neurochemical underpinnings of memory-related fMRI response changes following acute administration of THC and CBD in a randomized, double-blind, placebo-controlled, cross-over design. A total of 9 healthy participants ages 18-40 will be enrolled. Participants will first undergo one screening visit (~4 hours), comprising informed consent, assessment of health history, psychiatric diagnoses, cognitive function, and substance use history, and a structural MRI session. This will be followed by 3 separate MJ dose visits (~4 hours each), at which participants will complete neuroimaging after administration of one of 3 preparations of vaporized MJ in a randomized, counterbalanced, double-blinded fashion: 1) high THC and no CBD (THC), 2) high THC and high CBD (THC+CBD), and 3) no THC and no CBD (placebo MJ). As in the investigator's ongoing studies, bulk MJ plant material will be provided by the National Institute on Drug Abuse. MJ dose visits will comprise MJ administration, blood collection, MRS/fMRI scan, subjective reports, and a brief cognitive assessment.

Enrollment: 9 estimated patients

Sex: All

Ages: 18 to 40 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Right-handed
• Prior MJ users (has used MJ at least once in the past year, but no more than 1x/month in the past 12 months)
• Medically healthy (as determined by medical history and treatment)
• Adequate comprehension of English in order to complete study materials
• Acceptable birth control method for women (i.e., no copper IUD or any device that is not MRI safe)

Exclusion criteria

• Participant currently uses psychoactive medications or substances
• Psychiatric diagnoses (determined by DSM-V)
• Participant heavily or regularly uses MJ (more than 1x/month in the past year)
• Current or past substance dependence (including MJ)
• Positive urine toxicology screens
• Positive pregnancy screens
• MRI contraindications (e.g., heart pacemaker)

Trial design

Primary purpose: Other

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: Quadruple Blind

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9 participants in 3 patient groups

Occasional Users - High THC and High CBD Dose

Experimental group

Description:

People who smoke marijuana occasionally will be given a dose of high THC high CBD marijuana at the study visit

Treatment:

Drug: High THC/High CBD Marihuana

Occasional Users - High THC and No CBD Dose

Experimental group

Description:

People who smoke marijuana occasionally will be given a dose of high THC and no CBD marijuana at the study visit

Treatment:

Drug: High THC/No CBD Marihuana

Occasional Users - No THC and No CBD Dose

Experimental group

Description:

People who smoke marijuana occasionally will be given a dose of marijuana that contains no THC or CBD

Treatment:

Drug: No THC/No CBD Marihuana