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Abstract
The effect of a single treatment with cigarette smoke on the blood levels and hemodynamic effects of propranolol in rats was studied. Pentobarbital sleep time was not affected whereas zoxazolamine paralysis time was shortened 72% in rats, 24 h after the cigarette smoke exposure. The beta-adrenoceptor blocking effect of propranolol observed at 10 and 20 min time intervals was abolished in rats exposed to cigarette smoke 24 h after the exposure. The blood propranolol concentrations were decreased in rats pretreated with phenobarbital, 3,4-benzpyrene and ethanol as well as in cigarette smoke exposed rats. Among several factors that could influence propranolol metabolism, in this study, enzyme induction is suggested to be dominant.
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