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Relative bioavailability of chlorthalidone in humans: adverse influence of polyethylene glycol.

The bioavailability of two commercial preparations of chlorthalidone was studied in healthy male subjects. Reference solutions/suspensions for the two products were chlorthalidone dissolved in a solution of water-polyethylene glycol and a solution/suspension of chlorthalidone. Bioavailability of the chlorthalidone in water-polyethylene glycol solution was significantly reduced in comparison to one of the commercial preparations, and trends in the data suggested that it was less well absorbed than either the chlorthalidone in water solution/suspension or the other commercial preparation of chlorthalidone. These data, together with previous reports indicating that polyethylene glycol may retard the absorption of some drugs in vitro, suggest that this compound should not be used to aid dissolution of drug in a reference standard for bioavailability investigations.