Comparison of behavioral effects of morphine and fentanyl in dogs and cats |
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Authors: | Kamata Masatoshi Nagahama Shotaro Kakishima Kei Sasaki Nobuo Nishimura Ryohei |
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Affiliation: | Laboratory of Veterinary Emergency Medicine, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1–1–1 Yayoi, Bunkyo-ku, Tokyo 113–8657, Japan. |
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Abstract: | Behavioral effects induced by intravenous administration of morphine at 0.3, 0.6, 1.2, and 2.4 μg/kg and fentanyl at 5, 10, 20, and 40 μg/kg were evaluated in dogs and cats. In dogs, fentanyl and morphine depressed activity and level of consciousness in a dose- dependant manner. In cats, higher doses of fentanyl stimulated activity temporarily, but excitement, so-called "opioid mania," was not observed. Morphine induced distinctive behavioral changes characterized by sitting with fixed staring, and "opioid mania" was not observed in cats. |
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