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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

N-desmethyldiazepam physical dependence in dogs.

Dogs, surgically implanted with a chronic gastric fistula, were chronically dosed with N-desmethyldiazepam (32 mg/kg/day) in four divided doses to attain N-desmethyldiazepam plasma levels comparable to those observed in dogs dependent on diazepam (60 mg/kg/day). The time course of N-desmethyldiazepam abstinence was studied, beginning not less than 2 weeks after stabilization levels had been achieved. The abstinence syndrome observed after abrupt discontinuation of N-desmethyldiazepam was similar to the diazepam abstinence syndrome but differed in several important aspects. In diazepam-dependent dogs, there was a short burst of tremor very early in withdrawal (approximately 1-2 hr after the last dose of diazepam) that was not seen in N-desmethyldiazepam-dependent dogs. Signs of abstinence such as tremor, hot foot walking and twitches and jerks were more frequently observed in N-desmethyldiazepam-dependent dogs than in diazepam-dependent dogs as were decreases in food and water intake and in body weight. The overall intensity of abstinence, as measured by the Diazepam Withdrawal Abstinence Scale, was greater in N-desmethyldiazepam-dependent dogs than in dogs dependent on either lorazepam or diazepam. Plasma levels of N-desmethyldiazepam and oxazepam were nearly equal in dogs dependent on diazepam or on N-desmethyldiazepam and were 4 to 10 times greater than the plasma levels of diazepam or lorazepam in diazepam- or lorazepam-dependent dogs, respectively. Furthermore, the plasma levels of N-desmethyldiazepam and oxazepam declined much more slowly than the levels of diazepam and lorazepam. These results suggest that physical dependence on diazepam is caused by the accumulation and actions of N-desmethyldiazepam.(ABSTRACT TRUNCATED AT 250 WORDS)[1]

References

  1. N-desmethyldiazepam physical dependence in dogs. McNicholas, L.F., Martin, W.R., Pruitt, T.A. J. Pharmacol. Exp. Ther. (1985) [Pubmed]
 
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