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Related Concept Videos

Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

91
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...
91
Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

111
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,...
111
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...
1.6K
Allergic Reactions02:06

Allergic Reactions

33.3K
Overview
33.3K
Cross-reactivity00:42

Cross-reactivity

33.7K
Overview
33.7K
Hypersensitivities01:30

Hypersensitivities

8.1K
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...
8.1K

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Related Experiment Video

Updated: Mar 16, 2026

Humanized Mediator Release Assay as a Read-Out for Allergen Potency
10:22

Humanized Mediator Release Assay as a Read-Out for Allergen Potency

Published on: June 29, 2021

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Drug Allergy.

Abdul Waheed1, Tiffany Hill1, Nidhi Dhawan1

  • 1Department of Family & Community Medicine, Milton S. Hershey Medical Center, Penn State College of Medicine, Hershey, PA, USA.

Primary Care
|August 23, 2016
PubMed
Summary

Adverse drug reactions are common (Type A) or uncommon (Type B) responses to medications. Accurate diagnosis and classification are crucial for patient safety and preventing future drug reaction issues.

Area of Science:

  • Pharmacology
  • Clinical Medicine
  • Allergy Immunology

Background:

  • Adverse drug reactions (ADRs) are unintended responses to medications.
  • Type A ADRs are predictable based on dose or drug interactions.
  • Type B ADRs are rare and unpredictable, often immune-mediated.

Purpose of the Study:

  • To highlight the importance of diagnosing and classifying adverse drug reactions.
  • To emphasize strategies for managing patients experiencing drug reactions.
  • To guide clinical practice in identifying and treating ADRs.

Main Methods:

  • Review of adverse drug reaction types and diagnostic approaches.
  • Clinical assessment including patient history and physical examination.
  • Consideration of allergy testing and specialist consultation.
Keywords:
DiagnosisDrug allergyDrug reactionHypersensitivityPresentationPreventionTreatment

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Main Results:

  • Distinguishing between predictable (Type A) and unpredictable (Type B) ADRs is key.
  • Proper documentation aids in preventing recurrent ADRs.
  • Allergy testing and specialist input improve diagnostic accuracy.

Conclusions:

  • Accurate diagnosis and classification of ADRs are essential for patient care.
  • Consultation with allergy immunology specialists is recommended for complex cases.
  • Prophylactic prescription of epinephrine auto-injectors (EpiPen) may benefit patients with multiple allergy syndromes.