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Allergic Drug Reactions

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...

Hypersensitivities

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...

Allergic Reactions

Allergic Reactions

Desensitization and Tachyphylaxis

Desensitization and Tachyphylaxis

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.

Cross-reactivity

Cross-reactivity

Pharmacovigilance

Pharmacovigilance

Post-marketing surveillance is a critical component of pharmaceutical regulation, often uncovering unanticipated adverse drug reactions (ADRs) once a drug is widely used over an extended period.
This process, termed pharmacovigilance, aims to detect, evaluate, and minimize harmful effects related to medication use. The data collection for pharmacovigilance depends on spontaneous reporting systems, where healthcare professionals or patients voluntarily report suspected ADRs.
In some cases, there...

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Related Experiment Video

Updated: Jan 3, 2026

Basophil Activation Test for Investigation of IgE-Mediated Mechanisms in Drug Hypersensitivity

Basophil Activation Test for Investigation of IgE-Mediated Mechanisms in Drug Hypersensitivity

Published on: September 16, 2011

Drug Hypersensitivity Reactions.

Mark S Dykewicz¹, Jason K Lam¹

¹Section of Allergy and Immunology, Division of Infectious Diseases, Allergy and Immunology, Department of Internal Medicine, Saint Louis University School of Medicine, Saint Louis University Allergy & Immunology, 1402 South Grand Boulevard Room M 157, St Louis, MO 63104, USA.

The Medical Clinics of North America

|November 24, 2019

Summary

This summary is machine-generated.

Drug hypersensitivity reactions (DHRs) are classified by timing and clinical presentation. Management options include drug allergy testing and desensitization, with special considerations for various medications.

Keywords:

Adverse drug reaction Desensitization Drug allergy Drug hypersensitivity reaction Drug rash Graded challenge Skin testing

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Area of Science:

Clinical immunology
Pharmacology
Allergy and immunology

Background:

Drug hypersensitivity reactions (DHRs) present diverse clinical manifestations and timings.
Understanding DHRs is crucial for safe and effective patient management.
Current diagnostic and management strategies require careful consideration of drug classes.

Purpose of the Study:

To classify drug hypersensitivity reactions based on timing, mechanisms, and clinical patterns.
To review management strategies including alternative agent selection, drug allergy testing, graded challenge, and desensitization.
To discuss special considerations for specific drug categories.

Main Methods:

Classification of DHRs based on established criteria.
Review of diagnostic methods, including immediate skin testing and its limitations.
Discussion of desensitization as a temporary tolerance-inducing strategy.
Exploration of management nuances for specific drug classes.

Main Results:

Immediate skin testing has limitations in predicting DHRs for many drugs.
Desensitization provides temporary tolerance, contingent on continued drug administration.
Specific management approaches are necessary for antibiotics, ACE inhibitors, anesthetics, NSAIDs, radiocontrast media, and chemotherapy agents.

Conclusions:

DHRs require tailored management strategies based on reaction type and drug class.
Drug allergy testing and desensitization are valuable tools but have specific indications and limitations.
Further research into DHR mechanisms and improved diagnostic tools is warranted.