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Related Concept Videos

Drug toxicity: Drug–Drug Interaction01:30

Drug toxicity: Drug–Drug Interaction

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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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Pharmacokinetics: Drug–Drug Interactions01:25

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

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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...
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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.
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Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
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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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Updated: May 3, 2026

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Clinical drug interactions: a holistic view.

Anu Rahal1, A H Ahmad2, Amit Kumar3

  • 1Department of Veterinary Pharmacology and Toxicology, Uttar Pradesh Pandit Deen Dayal Upadhayay Pashu Chikitsa, Vigyan Vishwavidyalaya Evum Go-Anusandhan Sansthan, Mathura (UP)-281001, India.

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Summary

Drug interactions can occur when medications are combined with other substances like food or herbs. Understanding these xenobiotic interactions is crucial for safe and effective treatment in both humans and animals.

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Area of Science:

  • Pharmacology
  • Toxicology
  • Veterinary Medicine

Background:

  • Concurrent administration of drugs with other substances is common in clinical practice.
  • Xenobiotics (drugs, toxins, food) and endogenous compounds can influence physiological and biochemical processes.
  • These interactions can significantly alter drug metabolism, transport, and efficacy.

Purpose of the Study:

  • To review potential drug interactions with other co-administered substances.
  • To discuss the mechanisms underlying these hazardous interactions.
  • To provide guidance for confidently navigating drug combinations.

Main Methods:

  • Literature review of drug interactions.
  • Analysis of xenobiotic and endogenous compound effects.
  • Discussion of physiological and biochemical mechanisms.

Main Results:

  • Concurrent administration can lead to altered drug metabolism and transport.
  • Interactions can result in reduced drug efficacy or increased toxicity.
  • Potential risks are associated with drug combinations involving medicines, food, herbs, vitamins, and minerals.

Conclusions:

  • Awareness of potential interactions is vital for patient safety.
  • Understanding interaction mechanisms aids in risk assessment.
  • This review provides a framework for managing drug combinations safely.