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Factors Affecting Protein-Drug Binding: Drug Interactions01:23

Factors Affecting Protein-Drug Binding: Drug Interactions

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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.
Displacement interactions can have varying outcomes, ranging from toxicity to virtually...
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Combined Effects of Drugs: Synergism01:27

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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.
Such synergistic combinations...
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Combined Effects of Drugs: Antagonism01:30

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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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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.
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Agonism and Antagonism: Quantification01:14

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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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When it comes to infants and young children, they are typically administered smaller doses of medication in comparison to adults. This is primarily because their organ functions still need to fully develop, meaning their bodies are not as efficient at metabolizing or eliminating drugs. Additionally, their blood-brain barrier is more permeable than in adults. As a result, high concentrations of drugs can easily penetrate the central nervous system (CNS), potentially leading to neurological...
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Diagonal Method to Measure Synergy Among Any Number of Drugs
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Common Food and Drug Interactions.

Marry Vuong1, Camila González Aragón1, Stephanie S Montarroyos1

  • 1Nicklaus Children's Hospital, Miami, FL.

Pediatrics in Review
|January 31, 2023
PubMed
Summary

Suspect food-drug interactions when optimal medication therapy is suboptimal. Assessing diet, labs, and drug levels helps identify these interactions, which involve pharmaceutical, pharmacokinetic, or pharmacodynamic mechanisms.

Area of Science:

  • Pharmacology
  • Clinical Pharmacy
  • Nutritional Science

Background:

  • Food-drug interactions (FDIs) can compromise medication effectiveness and safety, even with optimal dosing and adherence.
  • Identifying FDIs is crucial for optimizing patient outcomes and preventing adverse events.
  • Understanding the mechanisms of FDIs aids in clinical management.

Purpose of the Study:

  • To review the types and common examples of food-drug interactions.
  • To outline methods for assessing suspected food-drug interactions.
  • To emphasize the importance of patient counseling and healthcare collaboration in managing FDIs.

Main Methods:

  • Literature review of pharmaceutical, pharmacokinetic, and pharmacodynamic interactions.
  • Discussion of diagnostic approaches including diet history, laboratory values, and drug concentrations.

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  • Highlighting common food culprits like grapefruit, dairy, vitamin K, tyramine-rich foods, and alcohol.

    • Main Results:

    • Three primary types of FDIs exist: pharmaceutical, pharmacokinetic, and pharmacodynamic.
    • Common interactions involve specific food groups and substances.
    • Assessment requires a comprehensive review of patient's medication and dietary history.

    Conclusions:

    • Suspected FDIs warrant thorough patient assessment, including diet and medication review.
    • Awareness of common interacting foods and mechanisms is key to prevention.
    • Effective patient counseling and interprofessional collaboration are vital for optimizing medication therapy and avoiding adverse effects.