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• W2019051350 abstract "It has been proposed that various effects of psychoactive drugs on the central nervous system may be related to the capacity of the drug to selectively concentrate in specific regions of the brain. In rat brain, cocaine effects on striatal and nucleus accumbens dopaminergic systems show quantitative differences. However, the disposition of cocaine in various brain regions has not been reported. In the present studies we examined the cocaine concentrations over time in serum and discrete brain regions of the rat after single intraperitoneal (i.p.) injection. At different time points (5, 10, 20, 30, 60, 120, and 240 min) after i.p. injection of cocaine hydrochloride (10 mg kg−1, free base) the rats were decapitated and cocaine in serum and various brain regions was quantitated by a specific gas liquid chromatographic method. There was large inter-individual variability in different rats at each time-point. The disposition pattern of cocaine in rats after i.p. administration was similar to that observed in humans after intranasal administration. Initial absorption rate was rapid and, on average, the peak levels of cocaine were achieved in 10 min. The cocaine levels remained relatively high over the next 50 min indicating continual absorption, and then declined with a rate such that the levels 4 h after cocaine administration were undetectable in most of the animals. The overall changes in cocaine levels in various brain regions paralleled the serum concentrations. The area under the cocaine concentration-time curve (AUC) revealed more than three-fold differences in cocaine accumulation in various brain regions. This unequal disposition of cocaine may be responsible in part for differential biochemical effects in different brain regions." @default.
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• W2019051350 date "1993-05-01" @default.
• W2019051350 modified "2023-10-11" @default.
• W2019051350 title "Cocaine disposition in discrete regions of rat brain" @default.
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• W2019051350 doi "https://doi.org/10.1002/bdd.2510140408" @default.
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