Abstract
The central and peripheral benzodiazepine (BZ) receptor antagonists, flumazenil (FLU) and PK 11195 (PK), administered intrathecally (IT) to diazepam (DZ)-dependent rats produced a precipitated abstinence syndrome. The scores for abstinence increased with increasing dose of FLU but not with increasing dose of PK. Twitches and jerks increased with increased doses of both. Head and body tremors were produced by FLU, but not by PK. Neither FLU nor PK precipitated abstinence in controls. In DZ-dependent rats IT administered FLU and PK did not significantly change the spectral content and the total power of the EEG. The data indicate that an abstinence syndrome is precipitated at the spinal level in DZ-dependent rats and that both central and peripheral BZ receptors are involved.
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