Abstract
Plasma oxprenolol concentrations were measured in six young healthy female volunteers after single oral dosing with a 16/260 oxprenolol Oros system on three separate occasions. Reproducibility was assessed by comparing individual plasma profiles, areas under the curve, peak concentrations and times to peak. Plasma concentration-time profiles were consistent with an extended duration of drug release from the Oros system. Individual and mean profiles on the three occasions were similar, and no significant differences in mean plasma levels, or derived pharmacokinetic parameters, were detected. The mean amount of drug in eight systems recovered from faeces corresponded to 11% of the dose. Individual amounts were related to the total transit time of the system through the body. The 16/260 Oros system functioned reproducibly within the gastrointestinal tract, and in vivo absorption mirrored in vitro drug release.
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