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Drug Toxicity: Allergic Reactions

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...

Desensitization and Tachyphylaxis

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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.
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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.
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Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...

Allergic Reactions: Anaphylaxis

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 Reactions

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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 Reactions

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Related Experiment Video

Updated: Jun 10, 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

General considerations on rapid desensitization for drug hypersensitivity - a consensus statement.

J R Cernadas¹, K Brockow, A Romano

¹Department of Allergy and Clinical Immunology, Medical University, H. S. João, Porto, Portugal. josefinacernadas@gmail.com

|August 19, 2010

Summary

This summary is machine-generated.

Drug desensitization induces temporary tolerance to essential medications causing hypersensitivity reactions. This high-risk procedure requires careful risk-benefit analysis and is crucial when alternative treatments are unavailable.

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Area of Science:

Clinical Immunology
Pharmacology
Allergy and Clinical Immunology

Background:

Drug hypersensitivity reactions are unpredictable, varying from mild to severe, and can affect any organ system.
While avoiding the offending drug is standard, some patients require essential medications, necessitating alternative management strategies.

Framework:

Drug desensitization is a procedure to induce a temporary state of tolerance to a drug causing hypersensitivity.
It involves administering gradually increasing doses of the medication over a short period until the full therapeutic dose is tolerated.

Implementation:

This high-risk procedure is reserved for patients where alternative therapies are less effective or unavailable, following a thorough risk-benefit assessment.
Protocols exist for desensitization to antibiotics, insulins, sulfonamides, chemotherapy, and biologic agents, primarily for IgE-mediated reactions but also for non-IgE-mediated ones.

Implications:

Desensitization creates a temporary tolerance that necessitates continuous drug administration, requiring re-administration for intermittent treatments like chemotherapy.
This work provides background for a database of standardized rapid desensitization protocols for various drug classes, accessible via the EAACI homepage.