Abstract
Effects of one week of benzodiazepine drug administration on central benzodiazepine receptor binding characteristics were evaluated in a series of experiments in male Sprague-Dawley rats. Administration of short- and intermediate-acting benzodiazepines was observed to increase the number of available receptor binding sites (B max) without changing affinity of drug for receptor. Furthermore, these changes did not occur after administration and withdrawal of long-acting benzodiazepines. In addition, there appeared to be a relationship between the affinity of the different benzodiazepines for the receptor and the degree of increase in the number of receptor binding sites. The results may help to explain the relationship between withdrawal of certain benzodiazepine drugs and the occurrence of rebound phenomena in clinical situations.
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