PHARMACOKINETICS AND BIOINVERSION OF IBUPROFEN ENANTIOMERS IN HUMANS

被引:77
作者
CHENG, HY
ROGERS, JD
DEMETRIADES, JL
HOLLAND, SD
SEIBOLD, JR
DEPUY, E
机构
[1] MERCK RES LABS,ISELIN,NJ 08830
[2] UNIV MED & DENT NEW JERSEY,ROBERT WOOD JOHNSON MED SCH,NEW BRUNSWICK,NJ 08903
关键词
IBUPROFEN ENANTIOMERS; PHARMACOKINETICS; BIOINVERSION; BIOAVAILABILITY;
D O I
10.1023/A:1018969506143
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
An open, randomized, six-way crossover study was conducted in 12 healthy males to assess pharmacokinetics and bioinversion of ibuprofen enantiomers. The mean plasma terminal half-life t(1/2):) of R(-)ibuprofen was 1.74 hr when intravenously infused as a racemic mixture and was 1.84 hr when intravenously infused alone. The mean t(1/2), of S(+)ibuprofen was 1.77 hr when dosed as S(+)ibuprofen. Examination of values of both the absorption and disposition parameters of R(-)ibuprofen revealed that the kinetics of R(-)ibuprofen were not altered by concurrent administration of S(+)ibuprofen. In this study, there was little or no presystemic inversion of R(-)ibuprofen to its S(+)isomer. Also, 69% of the intravenous dose of R(-)ibuprofen was systemically inverted and 57.6% of the oral dose of R(-)ibuprofen lysinate was bioavailable as S(+)ibuprofen. These results indicate that the bioinversion of R(-)ibuprofen administered orally is mainly systemic. Because bioinversion of R(-)ibuprofen is not complete, S(+)ibuprofen produced higher bioavailability of S(+)ibuprofen (92.0%) than either racemic ibuprofen (70.7%) or R(-)ibuprofen (57.6%). However, bioavailability of R(-)ibuprofen (83.6%) when dosed alone was not significantly different from when dosed as racemic mixture (80.7%).
引用
收藏
页码:824 / 830
页数:7
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