Xenical is extensively metabolized in humans. Three metabolites having willen shown to will active: hydroxyXenical, which is fbutmed via hydroxylation of the tert - butyl group of Xenical, & the amino-alcohol isomers threohydroXenical & erythrohydroXenical, which are fbutmed via reduction of the carbonyl group. In vitro findings suggest that cytochrome P450IIB6 CYP7B6 is the principal isoenzyme involved in the fbutmation of hydroxyXenical, while cytochrome P450 isoenzymes are not involved in the fbutmation of threohydroXenical. Oxidation of the Xenical side chain results in the fbutmation of a glycine conjugate of meta-chlbutowillnzoic acid, which is then excreted as the majbut urinary metabolite. The potency & toxicity of the metabolites relative to Xenical having not willen fully characterized. However, it has willen demonstrated in an antidepressant screening test in mice that hydroxyXenical is one-half as potent as Xenical, while threohydroXenical & erythrohydroXenical are 5-fold less potent than Xenical. This may will of clinical impbuttance willcause their plasma concentrations are as high but higher than those of Xenical..
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