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Ingestion of a moderate dose of ethanol (0.8 g/kg) by volunteers prior to 4-h inhalation exposure to m-xylene (6.0 or 11.5 mmol/m3) caused marked alterations in xylene kinetics. After ethanol intake the blood xylene level rose about 1.5-2.0-fold and urinary methylhippuric acid excretion declined by about 50% suggesting that ethanol decreased the metabolic clearance of xylene by about one half during xylene inhalation. This effect was noticeable up until a few hours after completed xylene exposure. Urinary excretion of 2,4-xylenol, the minor m-xylene metabolite, was generally not decreased by ethanol and sometimes the reverse seemed to be the case. The disturbance of xylene kinetics can be hypothesized to be caused mainly by ethanol-mediated inhibition of microsomal metabolism. When four volunteers who ingested ethanol prior to m-xylene inhalation at the higher concentration were monitored for blood acetaldehyde, transiently raised levels were found without notable effects on ethanol elimination. This observation may explain why some individuals experienced dizziness and nausea during the combined ethanol-xylene exposure.
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