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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...
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-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.
Agonism and Antagonism: Quantification01:14

Agonism and Antagonism: Quantification

When drugs are administered, they can elicit either an agonist or antagonist effect on the body. Agonism occurs when a drug activates a specific receptor, triggering a biological response. On the other hand, antagonism happens when a drug binds to the same receptors but blocks their activation, thereby preventing a biological response.
To quantify these effects, researchers use a dose-response curve, which provides valuable information about the potency and efficacy of a drug. Potency refers to...

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Diagonal Method to Measure Synergy Among Any Number of Drugs
12:08

Diagonal Method to Measure Synergy Among Any Number of Drugs

Published on: June 21, 2018

Drugs and their interactions.

Murat Cokol1

  • 1Sabanci University, Faculty of Engineering and Natural Sciences, Biological Sciences and Bioengineering Program, and Nanotechnology Research and Application Center, Istanbul 34956, Turkey. cokol@sabanciuniv.edu

Current Drug Discovery Technologies
|December 15, 2012
PubMed
Summary
This summary is machine-generated.

This study explores drug combinations, detailing how interactions can enhance or reduce therapeutic effects. Understanding these drug interactions is key to developing more effective combination therapies.

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Area of Science:

  • Pharmacology and Therapeutics
  • Drug Discovery and Development

Background:

  • Small molecules with selective efficacy are utilized as therapeutic drugs.
  • Drugs possess a therapeutic dose range balancing intended benefits against unintended side effects.
  • Treatment strategies involve monotherapy or drug combinations, each with unique considerations.

Purpose of the Study:

  • To illustrate potential advantages and pitfalls of drug treatment using case scenarios.
  • To explain the phenomenon of drug interactions in combination therapy.
  • To highlight the importance of understanding drug interactions for optimizing therapeutic value.

Main Methods:

  • Illustrative case scenarios were used to demonstrate drug treatment principles.
  • Drug interactions were classified based on their effects (synergistic or antagonistic).
  • The relationship between drug interactions and phenotypic outcomes was considered.

Main Results:

  • Drug combinations can exhibit synergistic (enhanced) or antagonistic (reduced) effects compared to individual drugs.
  • The outcomes of drug combinations can be surprising and differ from additive effects.
  • Phenotypic understanding is crucial for predicting and managing drug interaction effects.

Conclusions:

  • Understanding drug interactions is vital for predicting combination therapy outcomes.
  • Identifying synergistic drug combinations can lead to enhanced therapeutic efficacy.
  • Managing antagonistic interactions is essential to avoid reduced treatment benefits.