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James W. Leiphart, Cynthia V. Dills and Robert M. Levy

importance of studying the underlying pharmacology of the analgesic effect. The analgesia produced by intrathecally administered tizanidine has demonstrated specificity for neuropathic pain signs, leaving acute nociception relatively unaffected. 19 Intrathecally administered ST-91, another α 2 -adrenergic agonist, has proved to be analgesic bilaterally at low doses in rats with CCI but more analgesic in the contralateral paw than in the affected paw at high doses. 56 The different α 2 -adrenergic subtype specificities of these two drugs may possibly underlie the

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James W. Leiphart, Cynthia V. Dills, Ofer M. Zikel, Daniel L. Kim and Robert M. Levy

side effects and increasing local drug concentrations. 5 Intrathecally administered tizanidine has demonstrated significant antinociception in the tail-flick test (a measure of reflex nociception rather than neuropathic pain) and on visceral nociceptive pain in rats, without affecting blood pressure. 5, 9 In light of the efficacy of intrathecal tizanidine in animal models of nociceptive pain, we have evaluated the analgesic effect of this agent on chronic experimental neuropathic pain and determined its efficacy relative to that of morphine sulfate. Materials

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Oral Presentations

2010 AANS Annual Meeting Philadelphia, Pennsylvania May 1–5, 2010