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- W4255290429 abstract "Hyperalgesia occurring after the cessation of chronic opioid administration occurs in humans and has been modeled in rodents with chronic systemic and intrathecal administration paradigms. It is, however, unclear if this type of postanalgesic hyperalgesia is unique to opioids. The α2-adrenergic receptor agonist, dexmedetomidine (Dex), is similar to opioids in that it is an analgesic that interacts with cell-surface receptors linked to the inhibition of adenylate cyclase and the modulation of ion channel activity. In these studies, we first constructed antinociceptive dose-response curves for Dex and morphine (MSO4). The 50% effective doses for Dex and MSO4 administered intraperitoneally to C57Bl/6 mice were 75 μg/kg and 5.2 mg/kg, respectively. Using equally effective doses, we treated separate groups of mice with twice-daily injections of Dex or MSO4 for 5 days. Tolerance to these drugs was documented after this period. In the 16–72 h after cessation of administration, MSO4-treated mice demonstrated both thermal hyperalgesia and mechanical allodynia. However, the Dex-treated mice showed no changes in their thermal or mechanical withdrawal thresholds. We conclude that using this experimental paradigm, opioids but not an α2-adrenergic agonist, cause hyperalgesia and allodynia after cessation of chronic administration." @default.
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- W4255290429 date "2003-01-01" @default.
- W4255290429 modified "2023-09-24" @default.
- W4255290429 title "Dexmedetomidine Fails to Cause Hyperalgesia After Cessation of Chronic Administration" @default.
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- W4255290429 doi "https://doi.org/10.1213/00000539-200301000-00041" @default.
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