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To address the question whether this phenomenological lack
of stereoselectivity is also reflected in equal plasma con-
centrations of (R)- and (S)-PPC metabolites, (R)/(S) ratios
and enantiomeric excesses of all the metabolites between 0
and 144 h after administration were determined for three
CYP2C9*1/*1 and two *3/*3 allele carriers by the method
described above¡£
The enantiomeric excesses of the known (R)-4¡ä-, (R)-6-, and (R)-7-hydroxyl-
ated metabolites are consistently greater for CYP2C9*3/*3
allele carriers. This (R) enantiomer excess increases
markedly with time. Moderate (S) enantiomer excess for
the major 4¡ä- and 7-hydroxylation pathways is initially found for CYP2C9 wild-type subjects ¡£To a minor extent
this is true for the CYP2C9 variant allele carriers also

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