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ANESTHETIC PHARMACOLOGY

The Additive Antinociceptive Interaction Between WIN 55,212-2, a Cannabinoid Agonist, and Ketorolac

Ahmet Ulugöl^*, Filiz Özyigit^*, Özgür Yeilyurt, and Ahmet Dogrul

*Department of Pharmacology, Trakya University, Edirne, Turkey, and Gülhane Academy of Medicine, Ankara, Turkey

Address correspondence and reprint requests to Ahmet Dorul, MD, Gülhane Military Medical Academy, Faculty of Medicine, Department of Medical Pharmacology, Ankara, Turkey. Address e-mail to dogrula{at}gata.edu.tr

Combinations of nonsteroidal antiinflammatory drugs (NSAIDs) and opioids are widespread in the management of pain, allowing better analgesia with reduced side effects. Cannabinoids are promising analgesic drugs that have pharmacological properties similar to those of opioids. However, the beneficial effects of cannabinoids for pain treatment are counterbalanced by their psychotomimetic side effects. We designed the present study to evaluate the antinociceptive interaction between cannabinoids and NSAIDs in mice, using the acetic acid-induced writhing test and tail-flick test. Interactions were analyzed using isobolographic analysis. WIN 55,212-2, a cannabinoid agonist, and the NSAID ketorolac, either alone or in combination, produced dose-dependent antinociception in the writhing test. Isobolographic analysis showed additive interactions between WIN 55,212-2 and ketorolac when they were coadministered systemically. Ketorolac is inactive in the radiant heat tail-flick test in which WIN 55,212-2 was active. Ketorolac did not influence WIN 55,212-2–induced antinociception in the tail-flick test. This study demonstrated an additive antinociceptive interaction between WIN 55,212-2 and ketorolac in an inflammatory visceral pain model. The combination of cannabinoids and NSAIDs may have utility in the pharmacotherapy of pain.

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Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins with the assistance of Stanford University Libraries' HighWire Press®. Copyright 2006 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999