title: Reproducibility over time of mephenytoin and debrisoquine hydroxylation phenotypes.
abstract: Mephenytoin and debrisoquine hydroxylation phenotypes were determined twice in 15 Spanish healthy volunteers with an interval of about one year. The phenotype assignment did not change in any subject for either debrisoquine or mephenytoin. Among extensive metabolisers of mephenytoin, there was a slight increase (P = 0.04) of the mephenytoin-S/R enantiomeric ratio over the study period. The family members of a poor metaboliser of mephenytoin were phenotyped, and the heterozygous extensive metabolisers were found to have higher mephenytoin-S/R ratios than other extensive metabolisers suggesting a correlation between the genotype and the S/R ratio.
authors.affiliation: Department of Pharmacology and Psychiatry, University of Extremadura, Faculty of Medicine, Badajoz, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Llerena
authors.forename: M J
authors.initials: MJ
authors.lastname: Valdivielso
authors.forename: J
authors.initials: J
authors.lastname: Benítez
authors.forename: L
authors.initials: L
authors.lastname: Bertilsson
mesh_terms: D000328:Adult; D001189:Aryl Hydrocarbon Hydroxylases; D065731:Cytochrome P-450 CYP2C19; D019389:Cytochrome P-450 CYP2D6; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics; D003647:Debrisoquin / Q000378:metabolism*; D005260:Female; D006801:Humans; D006900:Hydroxylation; D008297:Male; D008617:Mephenytoin / Q000378:metabolism*; D006899:Mixed Function Oxygenases / Q000235:genetics; D010641:Phenotype; D015203:Reproducibility of Results; D013237:Stereoisomerism; D013997:Time Factors
chemical_list: D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D001189:Aryl Hydrocarbon Hydroxylases; C045793:CYP2C19 protein, human; D065731:Cytochrome P-450 CYP2C19; D019389:Cytochrome P-450 CYP2D6; D008617:Mephenytoin; D003647:Debrisoquin