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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...
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...
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-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.
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.
The most common type is receptor antagonism, where one drug acts as an antagonist to block the effects of another drug by...
Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...

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Diagonal Method to Measure Synergy Among Any Number of Drugs
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Published on: June 21, 2018

[Drug interactions].

V Hafner1, B Grün, C Markert

  • 1Abteilung Klinische Pharmakologie und Pharmakoepidemiologie, Universität Heidelberg, Heidelberg, Deutschland.

Der Internist
|February 4, 2010
PubMed
Summary
This summary is machine-generated.

Drug interactions can improve effectiveness or cause adverse reactions. Understanding how drugs affect each other, through pharmacokinetics or pharmacodynamics, is key to safe and effective medication use.

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Area of Science:

  • Pharmacology
  • Drug Metabolism
  • Drug Interactions

Context:

  • Drug-drug interactions (DDIs) are common.
  • DDIs can be beneficial or harmful, leading to adverse drug reactions.
  • Understanding DDIs is crucial for patient safety.

Purpose:

  • To explain the mechanisms of drug-drug interactions.
  • To highlight the impact of DDIs on drug effectiveness and safety.
  • To emphasize the importance of considering pharmacokinetic and pharmacodynamic alterations.

Summary:

  • Pharmacokinetic DDIs alter drug absorption, distribution, metabolism, and excretion (ADME).
  • Cytochrome P450 enzymes and ABC-transporters significantly influence drug clearance.
  • Pharmacodynamic DDIs modify drug effects without changing drug concentrations, potentially requiring dose adjustments.

Impact:

  • Improved understanding of DDI mechanisms.
  • Enhanced strategies for managing drug therapy and minimizing adverse events.
  • Guidance for optimizing drug dosing in the presence of interactions.