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Related Experiment Videos

Grapefruit juice-drug interactions

D G Bailey1, J Malcolm, O Arnold

  • 1Department of Medicine, London Health Sciences Centre, Ontario, Canada.

British Journal of Clinical Pharmacology
|September 2, 1998
PubMed
Summary
This summary is machine-generated.

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Grapefruit juice significantly increases oral drug bioavailability by reducing intestinal metabolism via cytochrome P450 3A4 (CYP3A4). This interaction, lasting up to 24 hours, varies individually based on CYP3A4 levels and affects numerous medications.

Area of Science:

  • Pharmacology
  • Drug Metabolism
  • Gastroenterology

Background:

  • Grapefruit juice unexpectedly enhances oral drug bioavailability.
  • This effect was initially observed during a felodipine and ethanol interaction study.

Purpose of the Study:

  • To investigate the mechanism behind grapefruit juice's augmentation of oral drug bioavailability.
  • To identify the specific enzymes and factors involved in this drug interaction.

Main Methods:

  • Investigated the interaction between grapefruit juice and felodipine.
  • Assessed the impact of grapefruit juice on cytochrome P450 3A4 (CYP3A4) expression and activity.
  • Evaluated drug interactions with grapefruit juice for over 20 other medications.

Main Results:

Related Experiment Videos

  • Grapefruit juice reduces presystemic metabolism by down-regulating intestinal CYP3A4 expression.
  • The interaction can last up to 24 hours, leading to cumulative increases in drug levels (AUC and Cmax).
  • Individual variability in interaction magnitude is linked to baseline CYP3A4 protein expression.

Conclusions:

  • Grapefruit juice significantly impacts the bioavailability of drugs metabolized by CYP3A4.
  • Clinically relevant interactions are likely for various medications, including dihydropyridines, terfenadine, and cyclosporin.
  • Individual susceptibility, juice type/amount, and administration factors influence the interaction's significance.