Abstract

The in vitro adsorption characteristics and the inhibitory effect on drug absorption in man of commercial activated charcoal tablets and activated charcoal powder were determined, using phenylpropanolamine as the test drug. The rate and extent of drug adsorption on charcoal in tablets in vitro were much lower than on the charcoal powder. Under the conditions of the study, equal doses of charcoal tablets and powder reduced phenylpropanolamine absorption in healthy adult volunteers by 48 and 73%, respectively.

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