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This in vivo study is the first to present intraluminal ethanol concentrations in man after the intake of alcoholic beverages. Relatively low and fast declining gastric ethanol concentrations were observed, contrasting with the current Food and Drug Administration guidelines for the in vitro testing of formulations with respect to ethanol resistance. The presented gastric and duodenal ethanol concentrations and their variation may serve as reference data to design relevant models for predicting (i) ethanol resistance of drug formulations and (ii) ethanol effects on drug solubility and permeability.

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