Chao-Xuan Zhang, Xiangyong Cui, Yan Yang
Mar 18, 2011
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0
Influential Citations
5
Citations
Quality indicators
Journal
Xenobiotica
Abstract
Felbinac trometamol (trishydroxymethylaminomethane 4-biphenylacetate) is a new water-soluble salt of felbinac currently undergoing clinical evaluation as an intravenous (i.v.) formulation for the treatment of severe post-operative pain. This article reports the pharmacokinetics of felbinac after i.v. administration of felbinac trometamol in Sprague–Dawley rats. The maximum plasma concentration (C0) and area under the plasma concentration-time curve (AUC) of felbinac administered at doses of 3.36, 8.40 and 21.0 mg/kg felbinac trometamol increased linearly with dose. Felbinac was highly protein bound (~95%) at plasma concentrations up to 75 μg/ml and extensively metabolized with only small amounts being excreted unchanged in urine (0.318%), feces (0.530%) and bile (0.465%). 4′-Hydroxyfelbinac was the principal metabolite in urine, feces and bile together with felbinac glucuronide, 4′-hydroxyfelbinac glucuronide and sulfate. The majority of the administered dose was excreted in urine (63.6%) mostly as 4′-hydroxyfelbinac. Total drug in urine and feces accounted for about 72% of the dose. It would appear that felbinac trometamol has the potential to replace lipid-based NSAID formulations and progress to clinical evaluation.