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Related Concept Videos

Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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 exposure to a...
Allergic Drug Reactions01:27

Allergic Drug Reactions

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 numerous...
Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

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, heparin),...
Hypersensitivities01:30

Hypersensitivities

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...
Drug toxicity: Idiosyncratic Reactions01:16

Drug toxicity: Idiosyncratic Reactions

Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...

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Related Experiment Video

Updated: Jun 22, 2026

Basophil Activation Test for Allergy Diagnosis
07:22

Basophil Activation Test for Allergy Diagnosis

Published on: May 31, 2021

Provocation tests in drug hypersensitivity.

Werner Aberer1, Birger Kränke

  • 1Department of Dermatology and Venerology, Medical University of Graz, Auenbruggerplatz 8, Graz A-8036, Austria. werner.aberer@medunigraz.at

Immunology and Allergy Clinics of North America
|July 1, 2009
PubMed
Summary
This summary is machine-generated.

Drug provocation testing is the gold standard for diagnosing drug hypersensitivity, accurately identifying allergies and other adverse reactions. While potentially risky, it

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Basophil Activation Test for Investigation of IgE-Mediated Mechanisms in Drug Hypersensitivity
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Last Updated: Jun 22, 2026

Basophil Activation Test for Allergy Diagnosis
07:22

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Published on: May 31, 2021

Basophil Activation Test for Investigation of IgE-Mediated Mechanisms in Drug Hypersensitivity
10:22

Basophil Activation Test for Investigation of IgE-Mediated Mechanisms in Drug Hypersensitivity

Published on: September 16, 2011

Measuring Local Anaphylaxis in Mice
07:49

Measuring Local Anaphylaxis in Mice

Published on: October 14, 2014

Area of Science:

  • Clinical immunology
  • Pharmacology
  • Allergy and immunology

Background:

  • Drug hypersensitivity reactions (DHRs) are common and can mimic other conditions.
  • Accurate diagnosis of DHRs is crucial for patient safety and appropriate treatment.
  • Provocation testing is considered the gold standard for diagnosing DHRs.

Purpose of the Study:

  • To evaluate the role and safety of drug provocation testing in diagnosing drug hypersensitivity.
  • To discuss the benefits and risks associated with provocation testing.
  • To highlight factors influencing the accuracy of provocation tests.

Main Methods:

  • Systematic review of provocation testing protocols and outcomes.
  • Analysis of risk-benefit ratios in individual patient cases.
  • Discussion of potential causes for false-positive and false-negative results.

Main Results:

  • Provocation tests reproduce allergic and non-allergic adverse drug reactions.
  • Potential harms necessitate careful risk-benefit assessment.
  • Factors like loss of sensitization and unaddressed cofactors can lead to inaccurate results.

Conclusions:

  • Drug provocation testing is a safe and effective method for confirming or excluding drug hypersensitivity when performed by experienced clinicians.
  • Careful patient selection and monitoring are essential for safe provocation testing.
  • Understanding potential pitfalls improves diagnostic accuracy.