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Related Concept Videos

Allergic Drug Reactions01:27

Allergic Drug Reactions

1.3K
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...
1.3K
Allergic Reactions02:06

Allergic Reactions

31.6K
Overview
31.6K
Hypersensitivities01:30

Hypersensitivities

6.0K
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...
6.0K
Upper Respiratory Drugs: First and Second-Generation Antihistamines01:15

Upper Respiratory Drugs: First and Second-Generation Antihistamines

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Antihistamines are a class of drugs widely used to alleviate the symptoms of allergies, such as sneezing, itching, and nasal congestion. They work by inhibiting the actions of histamine, which is released by immune cells in response to allergenic substances or tissue injuries.
Histamine binds to specific receptor sites, known as H1 receptors, on tissue cells, triggering inflammation and swelling. Antihistamines combat these effects by competing with histamine for these receptor sites. By...
828
Desensitization and Tachyphylaxis01:20

Desensitization and Tachyphylaxis

2.9K
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.
2.9K
Antiasthma Drugs: Mast Cell Stabilizers and Anti-IgE Drugs01:25

Antiasthma Drugs: Mast Cell Stabilizers and Anti-IgE Drugs

1.6K
Asthma is a chronic respiratory condition for which new therapeutic avenues, including anti-inflammatory drugs like mast cell stabilizers and anti-IgE treatments, continue to be developed.
Mast cell stabilizers, such as cromolyn (also known as sodium cromoglycate) and nedocromil (Tilade), are effective drugs in asthma management. These stabilizers hinder histamine release by skillfully obstructing the activation of mast cells and other cellular entities. Notably, they navigate this task without...
1.6K

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Related Experiment Video

Updated: Dec 19, 2025

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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Does delayed urticaria induced by drug allergy exist?

E Del Vescovo1, M Gelsomino1, G Bersani1

  • 1Allergy Unit, Pediatrics Area, Department of Life Sciences and Public Health, Policlinico Gemelli Universitary Foundation IRCCS, Catholic University of Sacred Heart, Rome 00168, Italy.

Allergologia Et Immunopathologia
|June 8, 2020
PubMed
Summary

This study reviews recent scientific reports on drug-induced delayed urticaria. It highlights discrepancies in definitions between major allergy organizations, suggesting a need for clearer guidelines for patient care.

Area of Science:

  • Allergy and Immunology
  • Pharmacology
  • Dermatology

Background:

  • Delayed urticaria is a hypersensitivity reaction to medications.
Keywords:
Delayed urticariaDrug allergyDrug reactions

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Last Updated: Dec 19, 2025

Basophil Activation Test for Investigation of IgE-Mediated Mechanisms in Drug Hypersensitivity
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  • Recent scientific literature and consensus reports address drug allergy.
  • Discrepancies exist in the definition and classification of delayed urticaria.