Evaluation of a [13C]-dextromethorphan breath test to assess CYP2D6 phenotype.

Abstract excerpt

A [(13)C]-dextromethorphan ([(13)C]-DM) breath test was evaluated to assess its feasibility as a rapid, phenotyping assay for CYP2D6 activity. [(13)C]-DM (0.5 mg/kg) was administered orally with water or potassium bicarbonate-sodium bicarbonate to 30 adult Caucasian volunteers (n=1 each): CYP2D6 poor metabolizers (2 null alleles; PM-0) and extensive metabolizers with 1 (EM-1) or 2 functional alleles (EM-2)....

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