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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...
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...
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...
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),...
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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Basophil Activation Test for Allergy Diagnosis
07:22

Basophil Activation Test for Allergy Diagnosis

Published on: May 31, 2021

Provocation tests in diagnosing drug hypersensitivity.

Philippe-Jean Bousquet1, Francesco Gaeta, Laure Bousquet-Rouanet

  • 1Département Biostatistique, Epidemiologie Clinique, Santé Publique et Information Médicale, Hôpital Carémeau, CHU de Nîmes, 30029 Nîmes Cedex 9, France. Philippejean.bousquet@orange.fr.

Current Pharmaceutical Design
|November 11, 2008
PubMed
Summary
This summary is machine-generated.

Drug provocation tests (DPTs) are the gold standard for diagnosing drug hypersensitivity, carefully administered to confirm or rule out reactions. These tests help optimize allergen avoidance and remove false hypersensitivity labels.

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Last Updated: Jun 28, 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

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Published on: September 16, 2011

Trans-vivo Delayed Type Hypersensitivity Assay for Antigen Specific Regulation
11:49

Trans-vivo Delayed Type Hypersensitivity Assay for Antigen Specific Regulation

Published on: May 2, 2013

Area of Science:

  • Clinical Immunology
  • Allergology
  • Pharmacovigilance

Background:

  • Drug hypersensitivity reactions (DHRs) pose diagnostic challenges.
  • Current allergologic tests may have limitations in sensitivity and specificity.
  • The European Network for Drug Allergy (ENDA) and European Academy of Allergology and Clinical Immunology (EAACI) provide guidance on DHR diagnosis.

Purpose of the Study:

  • To define and elaborate on the role of drug provocation tests (DPTs) in diagnosing drug hypersensitivity.
  • To outline the indications and considerations for performing DPTs.
  • To highlight the significance of DPTs in clinical decision-making for suspected drug allergies.

Main Methods:

  • Controlled administration of suspected drugs under medical supervision.
  • Evaluation of patient history and non-specific symptoms.
  • Comparison of DPTs with other allergologic tests (skin tests, in vitro assays).

Main Results:

  • DPTs are considered the gold standard for establishing or excluding drug hypersensitivity.
  • Key indications include non-suggestive histories and inconclusive allergologic tests.
  • DPTs are crucial for diagnosing hypersensitivity to beta-lactams, non-beta-lactam antibiotics, heparins, glucocorticoids, and NSAIDs.

Conclusions:

  • DPTs are essential for accurate diagnosis of drug hypersensitivity, guiding allergen avoidance.
  • A negative DPT can remove a false label of drug hypersensitivity, enabling necessary medication use.
  • Risk-benefit assessment is crucial before performing potentially harmful DPTs.