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Abstract:
Mice were either pretreated with naloxone (10 mg/kg i.p.) and then injected with a hypnotic, or given a similar dose of naloxone simultaneously with a hypnotic (combination treatment). Neither the naloxone pretreatment nor the combination treatment changed the time of on-set or the sleeping duration of urethane, chloral hydrate or ketamine. However, the naloxone pretreatment markedly decreased the on-set time and prolonged the sleeping duration of phenobarbitone and barbitone; naloxone in combination prolonged the sleeping duration of pentobarbitone, phenobarbitone and barbitone.