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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...

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),...

Hypersensitivity Reactions: Immune-Complex Reactions

Hypersensitivity Reactions: Immune-Complex Reactions

Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...

Hypersensitivity Reactions: Cytolytic Reactions

Hypersensitivity Reactions: Cytolytic Reactions

Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...

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 numerous...

Allergic Reactions

Allergic Reactions

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Related Experiment Video

Updated: Jun 24, 2026

High Throughput, Real-time, Dual-readout Testing of Intracellular Antimicrobial Activity and Eukaryotic Cell Cytotoxicity

High Throughput, Real-time, Dual-readout Testing of Intracellular Antimicrobial Activity and Eukaryotic Cell Cytotoxicity

Published on: November 16, 2016

Carmine hypersensitivity masquerading as azithromycin hypersensitivity.

Matthew Greenhawt¹, Marc McMorris, James Baldwin

¹University of Michigan Health Systems, Division of Allergy and Clinical Immunology, Food Allergy Specialty Clinic, Ann Arbor, Michigan 48106, USA. mgreenha@med.umich.edu

Allergy and Asthma Proceedings

|April 1, 2009

Summary

A patient experienced anaphylaxis from generic azithromycin due to carmine dye in the tablet coating, not the antibiotic itself. This highlights the importance of identifying dye allergies in medication hypersensitivity.

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Area of Science:

Allergy and Immunology
Pharmacology
Dermatology

Background:

Macrolide hypersensitivity is uncommon.
Carmine dye, derived from cochineal insects, is increasingly used in pharmaceutical coatings.
Identifying specific allergens in drug formulations is crucial for patient safety.

Observation:

A patient with known carmine hypersensitivity presented with anaphylaxis post-ingestion of generic azithromycin.
Skin-prick testing revealed hypersensitivity to carmine dye and the coating of the generic azithromycin tablet, but not the active antibiotic or the brand-name formulation.
The brand-name azithromycin (Zithromax) lacked carmine dye and was tolerated.

Findings:

The patient's anaphylaxis was attributed to carmine dye in the generic azithromycin tablet coating.
Skin-prick tests confirmed allergy to carmine dye and the specific colored coating.
This is the first reported case of carmine-induced anaphylaxis linked to a carmine-containing medication.

Implications:

Accurate patient history and targeted allergy testing are vital for diagnosing medication hypersensitivity.
Patients with carmine allergy must verify medication formulations to avoid adverse reactions.
Awareness of dye-related allergies can prevent unnecessary avoidance of essential antibiotic classes.