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The effect of ethanol (0.5 and 1.0 g/kg) on gastrointestinal absorption and presystemic biotransformation of propoxyphene (4 mg/kg) was studied in dogs in a crossover design. Low ethanol doses (0.5 g/kg) had no effect on the bioavailability of propoxyphene. High ethanol doses (1.0 g/kg) enhanced the bioavailability of orally administered propoxyphene significantly (p less than 0.05). With this dose of ethanol, the area under the blood concentration versus time curve (AUC)0-5 h of propoxyphene was approximately 200% of the control value. The level of norpropoxyphene, a major metabolite of propoxyphene, was significantly decreased (p less than 0.05) after administration of high ethanol doses. In all blood samples, after propoxyphene administration, an unidentified metabolite of propoxyphene was found, which formation was dose dependently inhibited by ethanol.
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