Differences between the tolerance characteristics of two anticonvulsant benzodiazepines in the amygdaloid-kindled rat

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Abstract

The characteristics of the development of tolerance to the anticonvulsant effects of chronic treatment by dipotassium clorazepate and diazepam using amygdaloid-kindled rats were investigated. Dipotassium clorazepate (5 mg/kg) or diazepam (5 mg/kg) were intraperitoneally administered for 10 consecutive days. Tolerance to the anticonvulsant effect of dipotassium clorazepate developed in seizure stage on day 6, after-discharge duration on day 7 and seizure latency on day 4. In contrast, tolerance to the effects of diazepam developed more rapidly in seizure stage on day 4, after-discharge duration on day 4 and seizure latency on day 3. Thus tolerance to the anticonvulsive effect of dipotassium clorazepate developed relatively slower than that to diazepam. All rats had stage 5 convulsions 24 hr after cessation of the administration of dipotassium clorazepate and diazepam. Concomitant determinations of plasma concentrations of the main metabolite of dipotassium clorazepate and diazepam, desmethyldiazepam, showed no statistical difference during treatment, suggesting that the developed tolerance was not metabolic but functional. © 2001 Elsevier Science Inc. All rights reserved.

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Amano, K., Katsuragi, S., Takamatsu, J., Ogata, A., Miyazaki, C., Deshimaru, M., & Miyakawa, T. (2001). Differences between the tolerance characteristics of two anticonvulsant benzodiazepines in the amygdaloid-kindled rat. Life Sciences, 69(9), 1049–1055. https://doi.org/10.1016/S0024-3205(01)01187-0

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