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a drug used as a sedative (= to calm a person or make them sleep)
A sedative of the benzodiazepine class, used (as the hydrochloride) chiefly as a premedication for anaesthesia; 8-chloro-6-(2-fluorophenyl)-1-methyl-4 H -imidazo[1,5- a ][1,4]benzodiazepine, C₁₈ H₁₃ ClFN₃.
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