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The authors demonstrated that 5 microg/mL Ò©ÎïA cannot inhibit metabolism of dextromethorphan, which is mainly mediated by CYP2D6.  And in the in vivo study, the authors suggested that non-linear pharmacokinetics of Ò©ÎïA is due to the saturation of metabolism mediated by CYP2D6.  However, the maximum unbound concentration of Ò©Îï is estimated to be around 13£¨Ò©ÎïÌåÄÚ×î´óŨ¶È£© * 0.15£¨ÌåÄÚÓÎÀëµÄÒ©Î = 1.95 microg/mL.  Thus, under such condition, CYP2D6-mediated metabolism cannot be inhibited at the plasma concentration of Ò©ÎïA the authors tested judging from the in vitro inhibition study.  How do the authors explain such discrepancy?
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