Clinical bioavailability evaluation of a controlled release formulation of diazepam

Abstract
A controlled release formulation of diazepam was compared to equal daily doses of the trade tablet under single day and steadystate conditions. Virtually no differences were found in the mean steadystate concentrations of diazepam or its metabolite, N-desmethyldiazepam, when the subjects received the 5 mg trade tablet three times daily or the 15 mg controlled release formulation once daily. Similarly, there was no difference in mean diazepam or N-desmethyldiazepam plasma concentrations when single doses of the controlled release formulation were given to fed or fasted volunteers. These data indicate that the controlled release formulation produces plasma concentrations of diazepam and N-desmethyldiazepam comparable to those achieved with the same daily dose of the trade product given three times daily, suggesting that these regimens can be used interchangeably.

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