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- W60439182 abstract "The hydrofluoroalkane (HFA) formulation of the inhaled corticosteroid flunisolide is a modification of the original chlorofluorocarbon formulation. HFA flunisolide substitutes an HFA for a chlorofluorocarbon propellant and uses a built-in spacer in its pressurized metered-dose inhaler. An open-label, randomized, three-way crossover, multiple-dose study evaluated the dose proportionality of three doses of flunisolide HFA. Twenty-one healthy volunteers received the following doses twice daily for 4.5 days: 85, 170, and 340 micrograms. Plasma levels of flunisolide and of the flunisolide metabolite 6 beta-OH flunisolide were measured after single- and multiple-dose administration. After a single dose, dose proportionality was observed across the three dose levels for peak plasma concentration (Cmax) and the area under the plasma concentration-time curve (AUC) up to both the time corresponding to the last measurable concentration (AUC0-tau) and the time to infinity (AUC0-infinity). After multiple doses, dose proportionality was observed for both Cmax and AUC at the medium and high doses. Predose plasma levels of flunisolide measured on day 4 were below the limit of detection. The elimination half-life of flunisolide ranged from 0.95 to 1.34 hours. After both single and multiple doses, dose proportionality was observed in dose-adjusted Cmax and AUC0-infinity for the inactive 6 beta-OH metabolite. HFA flunisolide was well tolerated. The lack of accumulation after repeated administration of HFA flunisolide suggests that the systemic exposure of flunisolide is low, which is a safety goal for inhaled corticosteroids." @default.
- W60439182 created "2016-06-24" @default.
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- W60439182 date "2002-09-01" @default.
- W60439182 modified "2023-09-23" @default.
- W60439182 title "Multiple-dose proportionality study of flunisolide hydrofluoroalkane." @default.
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