PROBLEM TO BE SOLVED: To provide a method for determining an effect of medication discharged outside a cell by P-gp.;SOLUTION: A biological sample collected from a subject is examined by a method that includes a step for measuring an amount of human miR-145 and determines an effect of medication discharged outside a cell by P-gp. It is preferable that the medication may be one selected from a group comprising anti-cancer drug, immunosuppressive drug, anti-HIV drug, colchicine, digoxin, quinidine, verapamil, and steroid. Further, it is preferable that the biological sample is blood.;COPYRIGHT: (C)2014,JPO&INPIT
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