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Related Experiment Videos

Grape fruit juice-drug interactions.

M Saeed Arayne1, Najma Sultana, Zakia Bibi

  • 1Department of Chemistry, University of Karachi, Karachi 75270. arayne@gawab.com

Pakistan Journal of Pharmaceutical Sciences
|December 29, 2005
PubMed
Summary
This summary is machine-generated.

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Grapefruit juice significantly increases oral drug bioavailability by reducing metabolism via cytochrome P450 3A4 (CYP3A4). This interaction, influenced by individual CYP3A4 levels, can lead to clinically relevant drug effects.

Area of Science:

  • Pharmacology
  • Drug Metabolism
  • Gastroenterology

Background:

  • Grapefruit juice (GJ) unexpectedly increases oral drug bioavailability.
  • This effect was initially observed with felodipine and ethanol.
  • GJ reduces presystemic drug metabolism by downregulating intestinal CYP3A4.

Purpose of the Study:

  • To investigate the mechanism of grapefruit juice-drug interactions.
  • To identify drugs likely to interact with grapefruit juice.
  • To understand factors influencing interaction variability.

Main Methods:

  • Investigated grapefruit juice's effect on felodipine metabolism.
  • Assessed CYP3A4 expression and activity.
  • Reviewed clinical data on drug interactions with grapefruit juice.

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Main Results:

  • Grapefruit juice selectively downregulates intestinal CYP3A4 expression.
  • Interactions are influenced by individual CYP3A4 levels and juice consumption.
  • Clinically significant interactions are likely for numerous drugs, including dihydropyridines, cyclosporin, and midazolam.

Conclusions:

  • Grapefruit juice significantly impacts oral drug bioavailability through CYP3A4 inhibition.
  • Individual susceptibility and consumption factors are critical.
  • While in vitro studies suggest specific compounds, their in vivo contribution remains debated.