Important note: Information in this article was accurate in 2007. The state of the art may have changed since the publication date.
United Press International - October 26, 2007
Lead researcher Mark Wallace the University of California, San Diego, found in the placebo controlled study of 15 subjects that a low dose of marijuana showed no effect, a medium dose provided moderate pain relief and a high dose increased the pain response.
The results suggest a "therapeutic window" for marijuana, Wallace said.
The study used capsaicin, an alkaloid derived from hot chili peppers that is an irritant to the skin, to mimic the type of neuropathic pain experienced by patients with HIV/AIDS, diabetes or shingles -- brief, intense pain following by a longer-lasting secondary pain.
The study, published in the journal Anesthesiology, found a decrease in pain at the medium dose. There was also a significant correlation between plasma levels of THC and decreased pain.
The analgesic effect wasnÆt immediate. It took about 45 minutes for the marijuana to have an impact on the pain, Wallace said.
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