Analgesic Efficacy of Smoked Cannabis

Study Overview
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Brief Summary
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The purpose of this study is to determine whether or not inhaled marijuana displays any pain-relieving properties on experimentally-induced pain.

Detailed Description
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It is important to evaluate the effects of the cannabinoids on facilitated pain as conditions of hyperalgesia more closely approximates the clinical situation. There are limited clinical studies on the effect of the cannabinoids on facilitated pain states. Noyes et al evaluated the analgesic effects of Delta-9-THC in 34 cancer patients with pain. They concluded that 20mg of oral Delta-9-THC was similar to 120mg of codeine (Noyes et al, 1975). Jain et al concluded that 1.5-3mg of intramuscular Levonantradol resulted in significant pain relief as compared to placebo in 56 patients with acute postoperative pain (Jain et al, 1981). Comparison(s): Three different doses of smoked cannabis will be compared to placebo for the reduction of experimentally induced pain.

Official Title
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Analgesic Efficacy of Smoked Cannabis

Conditions
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Pain, Hyperalgesia

Intervention / Treatment
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* Drug: Smoked Cannabis


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age 18-90 Male or Female Subject smoked cannabis within the last six months Exclusion Criteria: Active opportunistic infections or opportunistic malignancies requiring acute treatment Active substance abuse (alcohol or injection drug) Pulmonary complications (e.g., tuberculosis, asthma) Current use of cannabis (e.g., within 30 days of randomization) Pregnancy as ascertained by a self-report and a mandatory commercial pregnancy test before any cannabis or placebo consumption condition Personal or familial history of psychiatric disorder

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 90 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double


Arms and Interventions

| Intervention/Treatment |
| --- |
|Drug: Smoked Cannabis|nan|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Score on a Visual Analog Scale (VAS) of pain severity |  |  | 
| McGill Pain Questionnaire (MPQ) Short Form |  |  | 
| Neurosensory testing of: 1) warm and cold sensation, 2) warm and cold pain, 3) touch, and 4) mechanical pain. Testing administered using a Thermal Sensory Analyzer, von Frey hair filaments, and a pinch algometer, respectively. |  |  | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Trail Making Test (TMT) as a measure of psychomotor speed. |  |  | 
| Paced Auditory Serial Attention Test (PASAT) as a measure of speed of information processing. |  |  | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Pain, Cannabis, Analgesic