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Aging and the pharmacokinetics and metabolism of metoprolol enantiomers in the rat

(1993) JOURNALS OF GERONTOLOGY. 48(3). p.B108-B114
Author
Organization
Abstract
After i. v. administration of racemic metoprolol in the rat, the plasma concentrations of (R)- and (S)-metoprolol were comparable, and no differences in pharmacokinetic parameters between the two enantiomers were found. From the 3rd to the 12th month, comparable changes were seen for both enantiomers: there was an increase in the area under the plasma concentration-time curve (AUC) and a decrease in blood and plasma clearance. Half-life showed a significant prolongation, volume of distribution decreased between 3 and 12 months and increased between 12 and 24 months. After oral administration of the racemate, AUC and C(max) (maximum plasma concentration) were slightly higher, while oral clearance was slightly lower for (R)-metoprolol than for (S)-metoprolol. With aging, C(max) and AUC increased for both enantiomers, while oral clearance decreased. The change in oral clearance as a function of age is different between (S)- and (R)-metoprolol, and thus enantioselective. In vitro disappearance rate in 3-month-old rats was significantly higher for (S)-metoprolol than for (R)-metoprolol, although the difference was small. With aging, the disappearance rates of both enantiomers increased significantly, but not enantioselectively.
Keywords
ATENOLOL, PROPRANOLOL, HEALTHY, PLASMA, YOUNG, AGE

Citation

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Chicago
Vermeulen, An, Frans Belpaire, Frits De Smet, Isabelle Vercruysse, and Marcus Bogaert. 1993. “Aging and the Pharmacokinetics and Metabolism of Metoprolol Enantiomers in the Rat.” Journals of Gerontology 48 (3): B108–B114.
APA
Vermeulen, An, Belpaire, F., De Smet, F., Vercruysse, I., & Bogaert, M. (1993). Aging and the pharmacokinetics and metabolism of metoprolol enantiomers in the rat. JOURNALS OF GERONTOLOGY, 48(3), B108–B114.
Vancouver
1.
Vermeulen A, Belpaire F, De Smet F, Vercruysse I, Bogaert M. Aging and the pharmacokinetics and metabolism of metoprolol enantiomers in the rat. JOURNALS OF GERONTOLOGY. 1993;48(3):B108–B114.
MLA
Vermeulen, An, Frans Belpaire, Frits De Smet, et al. “Aging and the Pharmacokinetics and Metabolism of Metoprolol Enantiomers in the Rat.” JOURNALS OF GERONTOLOGY 48.3 (1993): B108–B114. Print.
@article{201716,
  abstract     = {After i. v. administration of racemic metoprolol in the rat, the plasma concentrations of (R)- and (S)-metoprolol were comparable, and no differences in pharmacokinetic parameters between the two enantiomers were found. From the 3rd to the 12th month, comparable changes were seen for both enantiomers: there was an increase in the area under the plasma concentration-time curve (AUC) and a decrease in blood and plasma clearance. Half-life showed a significant prolongation, volume of distribution decreased between 3 and 12 months and increased between 12 and 24 months. After oral administration of the racemate, AUC and C(max) (maximum plasma concentration) were slightly higher, while oral clearance was slightly lower for (R)-metoprolol than for (S)-metoprolol. With aging, C(max) and AUC increased for both enantiomers, while oral clearance decreased. The change in oral clearance as a function of age is different between (S)- and (R)-metoprolol, and thus enantioselective. In vitro disappearance rate in 3-month-old rats was significantly higher for (S)-metoprolol than for (R)-metoprolol, although the difference was small. With aging, the disappearance rates of both enantiomers increased significantly, but not enantioselectively.},
  author       = {Vermeulen, An and Belpaire, Frans and De Smet, Frits and Vercruysse, Isabelle and Bogaert, Marcus},
  issn         = {0022-1422},
  journal      = {JOURNALS OF GERONTOLOGY},
  keyword      = {ATENOLOL,PROPRANOLOL,HEALTHY,PLASMA,YOUNG,AGE},
  language     = {eng},
  number       = {3},
  pages        = {B108--B114},
  title        = {Aging and the pharmacokinetics and metabolism of metoprolol enantiomers in the rat},
  url          = {http://dx.doi.org/10.1093/geronj/48.3.B108},
  volume       = {48},
  year         = {1993},
}

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