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Abstract Title:

Low-Dose Vaporized Cannabis Significantly Improves Neuropathic Pain.

Abstract Source:

J Pain. 2012 Dec 10. Epub 2012 Dec 10. PMID: 23237736

Abstract Author(s):

Barth Wilsey, Thomas Marcotte, Reena Deutsch, Ben Gouaux, Staci Sakai, Haylee Donaghe

Article Affiliation:

VA Northern California Health Care System, and Department of Physical Medicine and Rehabilitation, University of California, Davis Medical Center, Sacramento, California. Electronic address: blwilsey@ucdavis.edu.

Abstract:

We conducted a double-blind, placebo-controlled, crossover study evaluating the analgesic efficacy of vaporized cannabis in subjects, the majority of whom were experiencing neuropathic pain despite traditional treatment. Thirty-nine patients with central and peripheral neuropathic pain underwent a standardized procedure for inhaling medium-dose (3.53%), low-dose (1.29%), or placebo cannabis with the primary outcome being visual analog scale pain intensity. Psychoactive side effects and neuropsychological performance were also evaluated. Mixed-effects regression models demonstrated an analgesic response to vaporized cannabis. There was no significant difference between the 2 active dose groups' results (P>.7). The number needed to treat (NNT) to achieve 30% pain reduction was 3.2 for placebo versus low-dose, 2.9 for placebo versus medium-dose, and 25 for medium- versus low-dose. As these NNTs are comparable to those of traditional neuropathic pain medications, cannabis has analgesic efficacy with the low dose being as effective a pain reliever as the medium dose. Psychoactive effects were minimal and well tolerated, and neuropsychological effects were of limited duration and readily reversible within 1 to 2 hours. Vaporized cannabis, even at low doses, may present an effective option for patients with treatment-resistant neuropathic pain. PERSPECTIVE: The analgesia obtained from a low dose of delta-9-tetrahydrocannabinol (1.29%) in patients, most of whom were experiencing neuropathic pain despite conventional treatments, is a clinically significant outcome. In general, the effect sizes on cognitive testing were consistent with this minimal dose. As a result, one might not anticipate a significant impact on daily functioning.

Study Type : Human Study

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Sayer Ji
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