<prompt> Which of the following agents do not act GABAA Cl- channel complex receptors?ZopicloneBenzodiazepinesThiopentonePromethazine  <response>: Zopiclone non benzodiazepine hypnotics ,benzodiazepine ,thiopentonebarbiturates all act on GABA-Cl channel ,whereas promethazin is a antihistamine drug that acts on histaminergic receptors which causes high sedation. Ref: KD Tripathio 8th ed. 