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Related Concept Videos

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...
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...
Drug toxicity: Drug–Drug Interaction01:30

Drug toxicity: Drug–Drug Interaction

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...
Factors Affecting Protein-Drug Binding: Drug Interactions01:23

Factors Affecting Protein-Drug Binding: Drug Interactions

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.
Displacement interactions can have varying outcomes, ranging from toxicity to virtually...
Protein-Drug Binding: Mechanism and Kinetics01:16

Protein-Drug Binding: Mechanism and Kinetics

Protein-drug binding refers to the interaction between drugs and proteins within the body. This binding process can occur intracellularly, involving drug interactions with enzymes or receptors within cells, or extracellularly, involving plasma proteins in the blood.
Various forces drive these interactions, including hydrogen bonds, hydrophobic interactions, ionic bonds, electrostatic interactions, and van der Waals forces. These bonds enable drugs to bind to specific sites on proteins,...
Drug-Receptor Interactions01:29

Drug-Receptor Interactions

Drug-receptor interaction describes the binding of receptors by drugs, but not all drug-receptor interactions result in activation and tissue response. For instance, the binding of agonists activates the receptor to generate a cellular reaction, while antagonists bind to receptors without causing their activation.
Several parameters, such as the drug's affinity for its receptor and its efficacy, which is its ability to activate the receptor, determine the drug's effect on the tissue.

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Cellular Membrane Affinity Chromatography Columns to Identify Specialized Plant Metabolites Interacting with Immobilized Tropomyosin Kinase Receptor B
11:44

Cellular Membrane Affinity Chromatography Columns to Identify Specialized Plant Metabolites Interacting with Immobilized Tropomyosin Kinase Receptor B

Published on: January 19, 2022

Important drug-nutrient interactions.

Pamela Mason1

  • 1The Rectory, Gwernesney, Usk, Monmouthshire NP15 1HF, UK. pmmason@gmx.com

The Proceedings of the Nutrition Society
|June 1, 2010
PubMed
Summary
This summary is machine-generated.

Drug-nutrient interactions can reduce medication effectiveness or cause harm, especially with critical drugs like warfarin. Healthcare professionals must assess supplement use to mitigate these risks.

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Experimental Quantification of Interactions Between Drug Delivery Systems and Cells In Vitro: A Guide for Preclinical Nanomedicine Evaluation

Published on: September 28, 2022

Area of Science:

  • Pharmacology
  • Nutritional Science
  • Clinical Medicine

Background:

  • Drug-nutrient interactions pose risks including reduced therapeutic efficacy, nutritional deficits, and adverse drug effects.
  • Despite over 40 years of interest, the prevalence and clinical importance of many drug-nutrient interactions remain uncertain.
  • Interactions are particularly significant for drugs with narrow therapeutic margins (e.g., theophylline, digoxin) or those requiring close monitoring (e.g., warfarin).

Purpose of the Study:

  • To review the potential for drug-nutrient interactions.
  • To highlight the clinical significance of these interactions.
  • To emphasize the need for professional vigilance and further research.

Main Methods:

  • Literature review and synthesis of existing knowledge on drug-nutrient interactions.
  • Identification of key examples of interacting substances (e.g., grapefruit juice, St. John's Wort).
  • Discussion of mechanisms by which drugs affect nutrient status and vice versa.

Main Results:

  • Drugs can alter appetite, taste, nutrient absorption, and metabolism.
  • Certain foods and supplements (e.g., grapefruit juice, St. John's Wort) are known to interact with medications.
  • A significant population is at risk due to concurrent use of supplements and prescribed drugs.

Conclusions:

  • Drug-nutrient interactions represent a considerable clinical challenge.
  • Healthcare professionals (pharmacists, dietitians, nurses, doctors) should routinely inquire about supplement use.
  • Further research is crucial, especially given complex drug regimens and novel pharmaceuticals.