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Pharmacokinetics: Drug–Food and Drug–Viral Interactions01:26

Pharmacokinetics: Drug–Food and Drug–Viral Interactions

A drug interaction occurs when the concurrent use of another drug, food, or an external substance alters the pharmacological activity of a drug. This interaction can modify the action of the original drug, affecting its effectiveness and safety.Drug–food interactions are significant as they impact drug absorption, metabolism, and excretion. For example, grapefruit juice is a well-known disruptor of drug metabolism. It inhibits the cytochrome P450 3A4 enzyme, crucial for the metabolism of many...
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Drug interactions occur when the pharmacological effect of one drug is altered by another substance, either enhancing or diminishing its activity. The drug whose activity is altered is known as the object drug, and the substance causing the alteration is called the agent drug or the precipitant. The net effects of these interactions are mostly undesirable, leading to decreased effectiveness or increased adverse effects. In rare cases, interactions can be beneficial, such as the enhanced...
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Drug–drug interactions can precipitate toxicity through multiple mechanisms. Absorption interactions alter how drugs enter the body, exemplified when ranitidine increases the absorption of basic drugs, while cholestyramine decreases the levels of propranolol. Protein binding interactions occur when drugs share the same binding sites on plasma proteins. Drugs like aspirin and warfarin, when bound in excess, can lead to increased free drug concentrations, enhancing the potential for...
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Related Experiment Video

Updated: Jun 17, 2026

Extraction and Purification of Polyphenols from Freeze-dried Berry Powder for the Treatment of Vascular Smooth Muscle Cells In Vitro
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Possible interaction between pomegranate juice and warfarin.

S Jarvis1, C Li, R G Bogle

  • 1Imperial Healthcare NHS Trust, Hammersmith Campus, DuCane Road, London W12 0NN, UK. sheba.jarvis@imperial.ac.uk

Emergency Medicine Journal : EMJ
|December 24, 2009
PubMed
Summary

Pomegranate juice may interact with warfarin, a common blood thinner. This juice can inhibit enzymes that metabolize warfarin, potentially increasing its effects and the risk of bleeding.

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Last Updated: Jun 17, 2026

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Area of Science:

  • Pharmacology
  • Nutritional Science
  • Clinical Medicine

Background:

  • Warfarin is a widely prescribed anticoagulant medication.
  • Pomegranate juice consumption is increasing in the UK.
  • Cytochrome P450 enzymes play a crucial role in drug metabolism, including warfarin.

Observation:

  • A potential interaction between pomegranate juice and warfarin is reported.
  • Laboratory studies indicate pomegranate juice inhibits cytochrome P450 enzymes.
  • These enzymes are involved in the metabolic pathways of warfarin.

Findings:

  • Pomegranate juice may alter warfarin metabolism.
  • This inhibition could lead to increased warfarin bioactivity.
  • The clinical significance requires further investigation.

Implications:

  • Healthcare providers should consider pomegranate juice intake in patients on warfarin.
  • Taking a comprehensive drug, food, and juice history is vital for managing anticoagulation.
  • Further research is needed to confirm the interaction and its clinical impact.