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Related Concept Videos

Allergic Drug Reactions01:27

Allergic Drug Reactions

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Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing...
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Hypersensitivities01:30

Hypersensitivities

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Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
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Cross-reactivity00:42

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Overview
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Dose-Response Relationship: Selectivity and Specificity01:25

Dose-Response Relationship: Selectivity and Specificity

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Drugs exert their therapeutic effects by interacting with receptors, enzymes, or ion channels that are present throughout the human body. The strength and duration of the interaction between a drug and its target receptor are characterized by the selectivity and specificity of the drug. Selectivity refers to a drug's strong preference for its intended target over other targets. For instance, isoprenaline, a non-selective β-adrenergic agonist, interacts with both β1- and...
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Desensitization and Tachyphylaxis01:20

Desensitization and Tachyphylaxis

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Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
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Combined Effects of Drugs: Antagonism01:30

Combined Effects of Drugs: Antagonism

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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.
The most common type is receptor antagonism, where one drug acts as an antagonist to block the effects of another drug by...
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Related Experiment Video

Updated: May 17, 2025

Basophil Activation Test for Investigation of IgE-Mediated Mechanisms in Drug Hypersensitivity
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[Multiple hypersensitivity versus multiple intolerance to drugs].

Eglė Janušonytė1, Dayana Jaramillo Loaiza2, Peter Jandus1

  • 1Service d'immunologie et allergologie, Hôpitaux universitaires de Genève, 1211 Genève 14.

Revue Medicale Suisse
|April 3, 2025
PubMed
Summary
This summary is machine-generated.

Multiple Drug Hypersensitivity Syndrome (MDHS) is rare and immune-mediated, while Multiple Drug Intolerance Syndrome (MDIS) involves non-immune reactions. Both conditions affect patients reacting to several unrelated drugs but have distinct causes and symptoms.

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Area of Science:

  • Immunology
  • Pharmacology
  • Clinical Medicine

Context:

  • Patients frequently experience reactions to multiple unrelated drugs in clinical practice.
  • Distinguishing between hypersensitivity and intolerance syndromes is crucial for patient management.

Purpose:

  • To differentiate Multiple Drug Hypersensitivity Syndrome (MDHS) from Multiple Drug Intolerance Syndrome (MDIS).
  • To outline the distinct pathophysiological mechanisms and clinical presentations of MDHS and MDIS.

Summary:

  • Multiple Drug Hypersensitivity Syndrome (MDHS) is a rare, T-lymphocyte mediated immune response to at least two distinct drugs, presenting with severe delayed rashes, eosinophilia, and liver enzyme elevation.
  • Multiple Drug Intolerance Syndrome (MDIS) is a diagnosis of exclusion, involving pseudoallergic, often immediate reactions to three or more unrelated drugs, confirmed by negative allergy tests.

Impact:

  • Clarifies diagnostic criteria for complex drug reactions.
  • Aids clinicians in accurate diagnosis and appropriate patient care for drug hypersensitivity and intolerance.