Warfarin is 90% protein bound. The total plasma concentration of warfarin was found to be 10 mg/L. What will be the new

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Warfarin is 90% protein bound. The total plasma concentration
of
warfarin was found to be 10 mg/L. What will be the new plasma level
of
free (unbound) warfarin if 10 % of the drug is displaced by
co-
administered aspirin? {Cfree= fu(Ctotal)}
a. 1 mg/L
b. 2 mg/L
c. 10 mg/L
d. 20 mg/L