The 1,4-benzodiazepine derivatives (diazepam, nitrazepm, lorazepam, clonazepam and two newly synthetized compounds of this series) increase the resistance of albino rats and rabbits to the toxic effect of oxygen under high pressure (7 and 5.5 atm respectively). The compounds under study are apt to avert over a long period the development of metabolic acidosis which appears following the action of high-pressure oxygen on the body.
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