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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 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 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 Reactions02:06

Allergic Reactions

Overview
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...
Cross-reactivity00:42

Cross-reactivity

Overview

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A Mouse Ear Model for Allergic Contact Dermatitis Evaluation
08:02

A Mouse Ear Model for Allergic Contact Dermatitis Evaluation

Published on: March 24, 2023

Drug allergy.

Richard Warrington1, Fanny Silviu-Dan

  • 1University of Manitoba, Winnipeg, Manitoba, Canada. RWarrington@exchange.hsc.mb.ca.

Allergy, Asthma, and Clinical Immunology : Official Journal of the Canadian Society of Allergy and Clinical Immunology
|December 15, 2011
PubMed
Summary
This summary is machine-generated.

Diagnosing drug allergy can be challenging due to diverse symptoms. Prompt referral to an allergist and careful evaluation are key for accurate identification and management of hypersensitivity reactions.

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Area of Science:

  • Clinical Immunology
  • Pharmacology
  • Allergy and Immunology

Background:

  • Drug allergy involves immune-mediated hypersensitivity reactions to medications.
  • Adverse drug reactions (ADR) impact quality of life, delay treatment, and can be fatal.
  • Diagnosis is complicated by varied symptoms, necessitating specialist evaluation.

Purpose of the Study:

  • To provide a background on drug allergy.
  • To outline diagnostic and management strategies for common drug-induced allergic reactions.
  • To discuss specific allergies including penicillin, sulfonamides, and NSAIDs.

Main Methods:

  • Diagnosis relies on detailed patient history and physical examination.
  • Diagnostic tools may include skin testing and graded drug challenges.
  • Management focuses on drug avoidance and substitution with chemically unrelated alternatives.

Main Results:

  • Effective management involves discontinuing the offending drug and using alternatives.
  • Supportive therapies include corticosteroids and antihistamines.
  • Anaphylaxis requires immediate epinephrine treatment; drug tolerance induction is an option for essential medications.

Conclusions:

  • Accurate diagnosis and management of drug allergy are crucial for patient safety and effective treatment.
  • Allergist consultation is recommended for suspected drug-induced hypersensitivity.
  • Understanding cross-reactivity is vital when selecting alternative medications.