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  • Title: Effects of dopaminergic agents on antinociception in formalin test.
    Author: Zarrindast MR, Nassiri-Rad S, Pazouki M.
    Journal: Gen Pharmacol; 1999 Apr; 32(4):517-22. PubMed ID: 10323495.
    Abstract:
    Morphine caused a dose-related antinociception in early phase and late phase of formalin test in mice. The D2 dopamine agonist quinpirole, but not the D1 dopamine agonist SKF 38393, increased the antinociceptive effect of morphine in both phases of the test. The antinociceptive effect of quinpirole also was decreased by sulpiride or domperidone pretreatment in the early phase of test. The D1 antagonist SCH23390, the D2 antagonist sulpiride, or the peripheral D2 dopamine antagonist domperidone, increased the morphine effect. Single administration of SKF38393, quinpirole, SCH23390, sulpiride, and domperidone also induce antinociception. The response of SCH23390, but not that of other dopamine agents, was antagonized with naloxone. The effects of the drugs alone and in combination with morphine have been discussed.
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