Birgit Kraft, MD, Anesthesiologist in the Department of Special Anesthesia and Pain Therapy at the Medical University of Vienna, et al., concluded in their study titled "Lack of Analgesia by Oral Standardized Cannabis Extract on Acute Inflammatory Pain and Hyperalgesia in Volunteers," published July 2008 in the journal Anesthesiology:

“The surprising result of our study was the absence of any kind of analgesic [pain relieving] activity of THC-standardized cannabis extract on experimentally induced pain using well-established human model procedures. Our results also seem to support the impression that high doses of cannabinoids may even cause increased sensitivity in certain pain conditions.”

July 2008