NCIt definition : The hydrochloride salt form of flurazepam, a member of the benzodiazepines and a long-acting
depressor of the central nervous system (CNS) with sedative and hypnotic effects.
Flurazepam binds to a specific site on the benzodiazepine-gamma-aminobutyric acid
(GABA)-A-chloride ionophore receptor complex located on the neuronal membrane. Binding
causes an allosteric modification of the receptor thereby enhancing the affinity of
GABA to the receptor leading to an increase in the frequency of chloride-channel opening
events, which leads to an increase in chloride ion conductance, neuronal hyperpolarization,
inhibition of the action potential, and a decrease in neuronal excitability. By modulating
binding of the GABA inhibitory neurotransmitter to GABA-A receptors in the ascending
reticular activating system, flurazepam blocks arousal of the cortical and limbic
system, thereby exerting its sedative and hypnotic effect.;