Abstract
Diazepam (DZP) pretreatment (100mg/kg, ip) of rats 6 h before pentobarbital administration (45 mg/kg, ip) prolonged the barbiturate-induced narcosis. The concentrations of [14C]pentobarbital and total pentobarbital derivatives in blood or brain showed no differences between control and DZP-pretreated animals. The brain and blood concentrations of pentobarbital, when measured at a time corresponding to the respective arousal times from pentobarbital narcosis, were lower in the DZP-pretreated group. These results indicate that acute DZP pretreatment increases the sensitivity of the rat brain to pentobarbital rather than inducing changes in the disposition of the barbiturate.
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