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Related Concept Videos

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–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...
Pharmacokinetics: Drug–Drug Interactions01:25

Pharmacokinetics: Drug–Drug Interactions

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 interactions are a critical aspect of pharmacology and can occur when two or more drugs compete for the same binding site. This competition can result in one drug displacing another, altering the effect of the displaced drug. Drug interactions are complex processes that rely heavily on how much of the displacer drug is present and how strongly it can bind to the same sites as the displaced drug.
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Combined Effects of Drugs: Antagonism01:30

Combined Effects of Drugs: Antagonism

The combined effects of drugs can result in various interactions, of which an important type is antagonism. Antagonism is a mechanism where one drug inhibits or counteracts the effects of another drug. Antagonism can occur through various means, including receptor binding, allosteric modulation, functional interaction, chemical reactions, and pharmacokinetic processes.
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Extraction and Purification of Polyphenols from Freeze-dried Berry Powder for the Treatment of Vascular Smooth Muscle Cells In Vitro
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[Fruit and berries--interactions with drugs].

Espen Molden1, Olav Spigset

  • 1Farmasøytisk institutt Universitetet i Oslo Postboks 1068 Blindern 0316 Oslo. espen.moldenfarmasi.uio.no

Tidsskrift for Den Norske Laegeforening : Tidsskrift for Praktisk Medicin, Ny Raekke
|December 18, 2007
PubMed
Summary

Certain fruits and berries can affect how the body processes drugs. Grapefruit, Sevillian orange, pomelo, and star fruit contain compounds that inhibit cytochrome P450 3A4 (CYP3A4), impacting drug metabolism.

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Area of Science:

  • Pharmacology
  • Nutritional Science
  • Biochemistry

Background:

  • Dietary components can significantly influence drug pharmacokinetics.
  • Several fruits and berries possess compounds that interact with drug-metabolizing enzymes.
  • Grapefruit is a well-documented example, but other fruits also exhibit such properties.

Purpose of the Study:

  • To review existing literature on drug-fruit/berry interactions.
  • To focus on the inhibition and induction of drug-metabolizing enzymes by fruits and berries.
  • To highlight the role of specific fruits in altering drug metabolism.

Main Methods:

  • Literature review of published studies.
  • Analysis of research on fruit-derived compounds affecting drug metabolism.
  • Focus on cytochrome P450 3A4 (CYP3A4) interactions.

Main Results:

  • Fruits like grapefruit, Sevillian orange, pomelo, and star fruit contain inhibitors of CYP3A4.
  • CYP3A4 is a critical enzyme in the metabolism of many drugs.
  • These fruits can alter the pharmacokinetics of co-administered drugs through enzyme inhibition.

Conclusions:

  • Consumption of certain fruits can lead to significant drug interactions.
  • Understanding these interactions is crucial for safe and effective drug therapy.
  • Further research into fruit-mediated enzyme modulation is warranted.