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Related Concept Videos

Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

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Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin,...
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Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial...
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Allergic Reactions02:06

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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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Cross-reactivity00:42

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Antibody Structure01:10

Antibody Structure

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Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
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Related Experiment Video

Updated: Apr 27, 2026

Basophil Activation Test for Allergy Diagnosis
07:22

Basophil Activation Test for Allergy Diagnosis

Published on: May 31, 2021

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Drug allergy diagnosis.

Anca M Chiriac1, Pascal Demoly2

  • 1Allergy Unit, Respiratoty and Addictology Department, Hôpital Arnaud de Villeneuve, 371, Avenue du Doyen Gaston Giraud, University Hospital of Montpellier Cedex 5, Montpellier 34295, France.

Immunology and Allergy Clinics of North America
|July 15, 2014
PubMed
Summary

Drug hypersensitivity (DH) is often poorly documented, impacting treatment decisions. Allergy testing and careful assessment can help diagnose true DH, clarifying its natural history.

Keywords:
Drug allergy work-upDrug hypersensitivity reactionImputabilityNatural historySeverity signs

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Area of Science:

  • Clinical immunology
  • Pharmacovigilance

Background:

  • Drug hypersensitivity (DH) is frequently self-reported and poorly documented in clinical practice.
  • DH significantly influences prescription patterns and patient management.
  • The natural history of true DH remains poorly understood.

Purpose of the Study:

  • To highlight the challenges in diagnosing drug hypersensitivity.
  • To emphasize the importance of clinical assessment in suspected DH reactions.
  • To discuss the role of allergy testing in confirming DH.

Main Methods:

  • Clinical evaluation of patients with suspected drug hypersensitivity.
  • Assessment of clinical signs and symptoms during a reaction.
  • Utilizing allergy testing for diagnostic confirmation.

Main Results:

  • Suspicion of DH is primarily based on clinical presentation.
  • A thorough risk/benefit analysis is crucial when re-challenging patients.
  • Diagnosis of DH is often achievable with appropriate allergy tests and clinical approach.

Conclusions:

  • Accurate documentation and diagnosis of DH are essential for safe prescribing.
  • A systematic approach combining clinical assessment and allergy testing aids in diagnosing DH.
  • Understanding the natural history of DH is critical for improving patient care.