CYP2D6-related oxidation polymorphism in Italy

E. Spina, G. M. Campo, A. Avenoso, A. P. Caputi, P. Zuccaro, R. Pacifici, G. Gatti, G. Strada, A. Bartoli, E. Perucca

Research output: Contribution to journalArticlepeer-review

Abstract

The distribution of the oxidation polymorphism related to cytochrome CYP2D6 (debrisoquine type) was determined in 246 healthy Italian volunteers. Phenotyping was based on HPLC determination of the dextrometorphan/dextrorphan concentration ratio (metabolic ratio) in urine samples collected over an 8 h interval following a single oral 30 mg dose of dextromethorphan hydrobromide. Urinary excretion of dextromethorphan showed a wide interindividual variability, ranging from ≤0.04 to 3.9% and from 0.5 to 79.6% of the dose, respectively. Metabolic ratios ranged from ≤0.001 to 6.6. Eleven of the 246 subjects showed a metabolic ratio greater than 0.30, indicating that 4.5% of the population could be ascribed to the poor metabolizer status. The frequency of the poor metabolizer phenotype in this population is within the range described for other Caucasian ethnic groups.

Original languageEnglish
Pages (from-to)281-289
Number of pages9
JournalPharmacological Research
Volume29
Issue number3
DOIs
Publication statusPublished - 1994

Keywords

  • CYP2D6
  • dextromethorphan
  • drug metabolism
  • phasmacogenetics

ASJC Scopus subject areas

  • Pharmacology

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