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Circadian changes in the interactions between L-NG-nitroarginine methyl ester (L-NAME), a nitric oxide synthase (NOS) inhibitor, and morphine-induced antinociception were investigated by the mouse hot-plate test. Both the basal pain sensitivity and morphine-induced analgesia undergo significant 24 h variations. L-NAME (40 mg/kg, i.p.) alone did not show any(More)
Circadian variations in the interaction between calcium channel blockers and morphine-induced analgesia were determined by the mouse hot-plate test. Calcium channel blockers diltiazem, verapamil, or nicardipine alone did not display any significant analgesic effect, but all of them potentiated morphine-induced analgesia when injected 30 min prior to(More)
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