A Clinico-Pharmacological Study on D-40 TA

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Clinicopharmacological effects and pharmacokinetics of a new triazolobenzo-diazepine derivative, D-40 TA, were studied in five healthy male volunteers (total cases amounting to six). A single dose of 4 mg of D-40 TA was given orally between 9 and 10 o'clock in the morning. On the average, all subjects fell asleep within 28±12 min and slept for 4.8±1.7 hr after taking the drug. Changes of physiological function were observed, such as hypotension, decrease of bowel tone, equilibrium disturbances and lowering of tractive force, but these changes were slight and recovered within twelve hours. There were no significant changes in respiratory rate, pulse rate, cutaneous blood flow, GSR and EKG. The results of psychomotor performance tests indicated that D-40 TA caused moderate to marked impairment of psychomotor function in three out of five subjects. The quantitative determination of unchanged D-40 TA in blood, urine and feces was carried out concurrently, but close relationship was not shown between blood level of D-40 TA and clinical symptoms. It was concluded that D-40 TA had a potent hypnotic activity with good tolerability in man.
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