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Allergic Reactions

Allergic Reactions

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...

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.

Adrenergic Agonists: Therapeutic Uses

Adrenergic Agonists: Therapeutic Uses

Adrenergic agonists have diverse therapeutic uses across various medical conditions and emergencies.
Emergency and Intensive Care Unit (ICU) applications: Pressor agents increase blood pressure, heart rate, and contractility in shock and organ failure situations. Dopamine can induce vasodilation and stimulate adrenoceptors. Endogenous catecholamines are effective in treating cardiogenic shock. α2-agonists like clonidine can reverse anesthesia-induced hypertension.
Allergies and...

Local Anesthetics: Adverse Effects

Local Anesthetics: Adverse Effects

While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
Once absorbed into the systemic circulation, local anesthetics can affect the organs that depend on the functioning of sodium...

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Related Experiment Video

Updated: Aug 24, 2025

Measuring Local Anaphylaxis in Mice

Measuring Local Anaphylaxis in Mice

Published on: October 14, 2014

Drug-induced Anaphylaxis.

Marina Labella^1,2, Rocío Saénz de Santa María², Gádor Bogas^1,2

¹Allergy Research Group, Instituto de Investigación Biomédica de Málaga-IBIMA, Málaga, Spain.

Current Pharmaceutical Design

|October 26, 2022

Summary

This summary is machine-generated.

Immediate drug hypersensitivity reactions are complex but improving diagnostic methods aid management. Understanding endotypes and phenotypes is key for accurate diagnosis, treatment, and preventing future episodes.

Keywords:

Allergy anaphylaxis basophil activation test desensitization drug provocation test hypersensitivity reactions skin test

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Last Updated: Aug 24, 2025

Measuring Local Anaphylaxis in Mice

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Published on: October 14, 2014

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

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

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

Published on: June 29, 2021

Area of Science:

Immunology
Clinical Medicine
Pharmacology

Background:

Drug hypersensitivity reactions are increasing globally with rising drug consumption.
Complex clinical presentations often occur alongside other illnesses or polypharmacotherapy.
Accurate diagnosis and management are critical for patient safety and outcomes.

Approach:

Systematic review of recent findings in immediate drug hypersensitivity.
Focus on advancements in endotyping, phenotyping, and biomarker identification.
Inclusion of studies on diagnostic methods (in vivo and in vitro) and management strategies.

Key Points:

Improved understanding of endotypes and phenotypes aids reaction categorization.
Discusses short- and long-term management of anaphylaxis, including drug-induced cases.
Highlights the role of hidden allergens and the importance of delabeling patients.

Conclusions:

Endophenotyping is crucial for accurate diagnosis and treatment of immediate drug hypersensitivity.
Effective management strategies can prevent future hypersensitivity episodes.
Drug desensitization offers a viable option for patients requiring specific medications.