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Related Concept Videos

Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

154
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...
154
Desensitization and Tachyphylaxis01:20

Desensitization and Tachyphylaxis

3.4K
Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
3.4K
Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

225
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...
225
Drug toxicity: Idiosyncratic Reactions01:16

Drug toxicity: Idiosyncratic Reactions

175
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...
175
Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

177
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...
177
Allergic Drug Reactions01:27

Allergic Drug Reactions

1.6K
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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Related Experiment Video

Updated: Apr 9, 2026

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

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Valproic acid hypersensitivity and desensitization.

Ori Toker1, Yuval Tal2, Liran Horev3

  • 1Allergy and Clinical Immunology Service, Shaare Zedek Medical Center, Pediatric Division, Affiliated with Hadassah-Hebrew University Medical School, Jerusalem, Israel.

Developmental Medicine and Child Neurology
|June 23, 2015
PubMed
Summary
This summary is machine-generated.

Rash is a common reason to stop antiepileptic drugs (AEDs). Successful desensitization to valproic acid was achieved in a patient with childhood absence epilepsy and a hypersensitivity reaction, offering a therapeutic option.

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Area of Science:

  • Neurology
  • Clinical Pharmacology

Background:

  • Hypersensitivity reactions to antiepileptic drugs (AEDs) are common, often necessitating treatment withdrawal.
  • Epilepsy management can be challenging when patients exhibit drug hypersensitivity, limiting therapeutic options.

Observation:

  • A 12-year-old male with childhood absence epilepsy presented with a rash, a hypersensitivity reaction to an antiepileptic drug.
  • This patient's epilepsy was refractory to other AEDs, making withdrawal problematic.

Findings:

  • Successful desensitization to valproic acid was achieved in the patient.
  • This intervention allowed for continued treatment with an otherwise effective AED.

Implications:

  • Desensitization offers a viable therapeutic strategy for managing non-life-threatening AED hypersensitivity reactions.
  • This approach can be crucial for patients with limited alternative treatment options for epilepsy.