The Pharmacokinetics and Pharmacodynamics of Oral and Vaporized Cannabidiol

The proposed study will be conducted at the Johns Hopkins Behavioral Pharmacology Research Unit (BPRU) and the Johns Hopkins Bayview Clinical Research Unit (CRU). Participants will complete 4 acute drug administration periods, each consisting of a single drug exposure followed by a 5-day observation period (3-days (58-hours) inpatient and 2-days outpatient). Biological specimens will be obtained to characterize the pharmacokinetics of THC, CBD, and their metabolites in whole blood, oral fluid, urine, and hair during this period. Each participant will receive all 4 dose conditions in a counterbalanced order using a placebo controlled within-subject crossover design. The 4 drug conditions are as follows:

• Condition 1: Inhalation of cannabis vapor containing approximately a 20:1 ratio of CBD:THC and will be measured to deliver a target dose of 100mg CBD and 5mg THC.
• Condition 2: Inhalation of 100mg CBD vapor.
• Condition 3: Ingestion of 100mg CBD.
• Condition 4: Placebo

Drug administration will be double blind and double dummy; both inhalation and oral ingestion of study drugs will occur during all 4 sessions. The order of drug administration will be counterbalanced across participants.

Research volunteers will be recruited until up to 18 participants have completed each of the four study sessions (received Conditions 1-4). Immediately before (baseline) and following each exposure, a battery of assessments including biological fluid collection and testing, subjective questionnaire administration, and performance testing will be conducted for all study participants. Post-exposure testing will be conducted in two phases: a 3-day (58 hour) residential stay, and a 2-day outpatient period, for a total of 5 days. Participants who drop out of the study prior to completion of all 4 drug conditions will be considered "incomplete" and replaced. Approximately one week (minimum of 6 days) will separate the administration of each dose.

The target demographic for study participation are healthy adults who: 1) have a history of intentionally inhaling cannabis/CBD, 2) have not used cannabis in the past month (desire is to have participants free of cannabinoids in biological matrices at the time of initial drug administration), and 3) who are not currently dependent on or seeking treatment for use of cannabis or other psychoactive drugs.