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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...
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...
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...
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: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...

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Related Experiment Video

Updated: May 11, 2026

Induction and Monitoring of Active Delayed Type Hypersensitivity (DTH) in Rats
13:26

Induction and Monitoring of Active Delayed Type Hypersensitivity (DTH) in Rats

Published on: July 19, 2007

[Severe delayed drug hypersensitivity reactions].

Christa-Maria Maniu1, Guillaume Buss, Laurence Feldmeyer

  • 1Service d'Immunologie et d'Allergie, CHUV, 1011 Lausanne. christa-maria.maniu@chuv.ch

Revue Medicale Suisse
|May 15, 2013
PubMed
Summary
This summary is machine-generated.

Severe drug hypersensitivity reactions like DRESS syndrome, AGEP, Stevens-Johnson syndrome, and toxic epidermal necrolysis can be life-threatening. Early detection of symptoms is crucial for prompt medical intervention and improved patient outcomes.

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Induction and Monitoring of Adoptive Delayed-Type Hypersensitivity in Rats
22:06

Induction and Monitoring of Adoptive Delayed-Type Hypersensitivity in Rats

Published on: October 1, 2007

Related Experiment Videos

Last Updated: May 11, 2026

Induction and Monitoring of Active Delayed Type Hypersensitivity (DTH) in Rats
13:26

Induction and Monitoring of Active Delayed Type Hypersensitivity (DTH) in Rats

Published on: July 19, 2007

Induction and Monitoring of Adoptive Delayed-Type Hypersensitivity in Rats
22:06

Induction and Monitoring of Adoptive Delayed-Type Hypersensitivity in Rats

Published on: October 1, 2007

Area of Science:

  • Dermatology
  • Clinical Pharmacology
  • Immunology

Context:

  • Delayed drug hypersensitivity reactions encompass a spectrum of severity.
  • While most are mild, severe systemic and cutaneous reactions pose significant health risks.

Purpose:

  • To discuss severe drug hypersensitivity reactions.
  • To highlight key entities: DRESS syndrome, AGEP, Stevens-Johnson syndrome, and TEN.

Summary:

  • Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS), Acute Generalized Exanthematous Pustulosis (AGEP), Stevens-Johnson syndrome (SJS), and Toxic Epidermal Necrolysis (TEN) are severe, potentially life-threatening drug reactions.
  • These reactions require prompt recognition and management.

Impact:

  • Early identification of warning signs and symptoms is critical.
  • Timely intervention can mitigate the severity and potentially life-threatening consequences of these adverse drug events.