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Related Experiment Videos

Racial differences in propranolol pharmacokinetics.

J A Johnson1, B S Burlew

  • 1Department of Clinical Pharmacy, College of Pharmacy, University of Tennessee, Memphis 38163.

Clinical Pharmacology and Therapeutics
|May 1, 1992
PubMed
Summary
This summary is machine-generated.

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Racial differences in propranolol (a blood pressure medication) response may not be due to unbound drug levels. Black subjects showed faster clearance, suggesting potential differences in liver metabolism.

Area of Science:

  • Pharmacology
  • Clinical Pharmacy
  • Drug Metabolism

Background:

  • Racial disparities in antihypertensive drug response are recognized.
  • Propranolol's varied efficacy across racial groups necessitates understanding underlying mechanisms.

Purpose of the Study:

  • To investigate racial differences in propranolol enantiomer pharmacokinetics and protein binding.
  • To determine if these pharmacokinetic variations contribute to differential antihypertensive responses between black and white subjects.

Main Methods:

  • A study involving 26 healthy men (13 black, 13 white) administered propranolol orally.
  • Serum samples analyzed for propranolol enantiomers using chiral HPLC.
  • Protein binding assessed via equilibrium dialysis.

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Main Results:

  • Black subjects exhibited lower area under the serum concentration-time curve (AUC) for both propranolol enantiomers compared to white subjects.
  • Apparent oral clearance of propranolol was significantly higher in black subjects than in white subjects.
  • No statistically significant differences were found in unbound fraction or unbound AUC between racial groups, possibly due to sample size limitations.

Conclusions:

  • Racial differences in unbound propranolol concentrations are unlikely to explain observed clinical response variations.
  • Higher apparent oral clearance in black subjects suggests potential racial differences in hepatic metabolism of propranolol.