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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),...
Allergic Reactions02:06

Allergic Reactions

Overview
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...
Pharmacovigilance01:19

Pharmacovigilance

Post-marketing surveillance is a critical component of pharmaceutical regulation, often uncovering unanticipated adverse drug reactions (ADRs) once a drug is widely used over an extended period.
This process, termed pharmacovigilance, aims to detect, evaluate, and minimize harmful effects related to medication use. The data collection for pharmacovigilance depends on spontaneous reporting systems, where healthcare professionals or patients voluntarily report suspected ADRs.
In some cases, there...

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Related Experiment Video

Updated: Jun 12, 2026

Basophil Activation Test for Allergy Diagnosis
07:22

Basophil Activation Test for Allergy Diagnosis

Published on: May 31, 2021

Patch testing in drug allergy.

Peter S Friedmann1, Michael Ardern-Jones

  • 1Dermatopharmacology Unit, Division of Infection, Inflammation and Immunity, University of Southampton School of Medicine, Sir Henry Wellcome Laboratories, Southampton General Hospital, Southampton, UK. psf@soton.ac.uk

Current Opinion in Allergy and Clinical Immunology
|May 21, 2010
PubMed
Summary
This summary is machine-generated.

Skin patch tests can aid in diagnosing T-cell-mediated drug allergies for specific conditions like exanthemata. However, their reliability varies, necessitating further research for consistent application in drug hypersensitivity diagnosis.

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Basophil Activation Test for Investigation of IgE-Mediated Mechanisms in Drug Hypersensitivity
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Precision Implementation of Minimal Erythema Dose (MED) Testing to Assess Individual Variation in Human Inflammatory Response
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Last Updated: Jun 12, 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

Precision Implementation of Minimal Erythema Dose (MED) Testing to Assess Individual Variation in Human Inflammatory Response
06:31

Precision Implementation of Minimal Erythema Dose (MED) Testing to Assess Individual Variation in Human Inflammatory Response

Published on: October 3, 2019

Area of Science:

  • Dermatology
  • Allergy and Immunology
  • Pharmacology

Background:

  • Skin patch testing is a diagnostic tool for certain drug hypersensitivity reactions.
  • Understanding the T-lymphocyte-mediated mechanisms is crucial for appropriate test application.
  • Current methodologies lack standardization, impacting diagnostic reliability.

Purpose of the Study:

  • To clarify the appropriate use of skin patch tests in drug allergy diagnosis.
  • To identify clinical patterns and drugs suitable for patch testing.
  • To understand the T-lymphocyte-mediated basis of reactions detected by patch tests.

Main Methods:

  • Review of existing literature on skin patch testing in drug hypersensitivity.
  • Analysis of clinical patterns associated with T-cell-mediated drug reactions.
  • Evaluation of patch test methodology and its principles.

Main Results:

  • Patch tests can elicit positive responses in a proportion of T-cell-mediated drug eruptions.
  • Effectiveness is noted for aromatic anticonvulsants and antibiotics but is inconsistent for other drugs.
  • Lack of standardized approaches and clear clinical entity definitions hinders robust evidence.

Conclusions:

  • Patch testing shows potential for diagnosing specific T-cell-mediated drug eruptions.
  • Further systematic research is needed to address inconsistencies and improve utilization.
  • The test is most reliable for certain drug classes, requiring careful consideration of clinical context.