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- W2076237022 abstract "Flurbiprofen, an arylpropionic acid (APA) class nonsteroidal antiinflammatory drug (NSAID), is commercially available only as the racemic mixture, although its pharmacologic effect has been credited primarily to the S isomer. In humans, the bioavailability of racemic flurbiprofen absorbed from the oral cavity has been studied measuring the total concentration of S- and R-flurbiprofen, and the pharmacokinetics of S- and R-flurbiprofen have been studied after oral administration of racemic flurbiprofen. In this study, the plasma concentrations of S-flurbiprofen and to some extent R-flurbiprofen were studied after brushing with a toothpaste containing different mixtures of S- and R-flurbiprofen. The toothpaste formulations contained 1% racemic (50:50), eutectic (14:86), 1%, 0.5%, and 0.25% (5:95) R- to S-flurbiprofen. Both S- and R-flurbiprofen were rapidly absorbed, with a time to reach maximum concentration (tmax) of 1.2 to 1.4 hours. Based on the AUC, the amount of S-flurbiprofen absorbed increased proportionally when given as the 0.25% (5:95) preparation to the 0.5% (5:95) mixture but did not increase significantly above the 0.5% (5:95) mixture when given as 1% (5:95) R- to S-flurbiprofen. This suggests that dose-proportional absorption of S-flurbiprofen is not maintained at higher concentrations. The elimination of S-flurbiprofen appears to be variable and prolonged after this mode of administration, as observed from plasma concentrations. Further controlled and more prolonged studies of S- and R-flurbiprofen are needed to confirm these observations." @default.
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- W2076237022 date "1996-06-01" @default.
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- W2076237022 title "Human Plasma Concentrations ofR, S, and Racemic Flurbiprofen Given as a Toothpaste" @default.
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- W2076237022 doi "https://doi.org/10.1002/j.1552-4604.1996.tb05044.x" @default.
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