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Related Concept Videos

Allergic Reactions: Anaphylaxis01:30

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),...
Drug Toxicity: Allergic Reactions01:30

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 Drug Reactions01:27

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...
Cross-reactivity00:42

Cross-reactivity

Overview
Allergic Reactions02:06

Allergic Reactions

Overview
Hypersensitivity Reactions: Cytolytic Reactions01:01

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...

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Related Experiment Video

Updated: May 28, 2026

Basophil Activation Test for Allergy Diagnosis
07:22

Basophil Activation Test for Allergy Diagnosis

Published on: May 31, 2021

Antibiotic allergy.

S Caimmi1, D Caimmi, E Lombardi

  • 1Department of Pediatrics, University of Pavia, Italy. sissi_del_78@hotmail.com

International Journal of Immunopathology and Pharmacology
|October 22, 2011
PubMed
Summary
This summary is machine-generated.

Antibiotic-induced anaphylaxis is common, especially with penicillin and cephalosporin. Allergy confirmation requires clinical history, skin tests, and drug challenges, not just in vitro tests.

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Area of Science:

  • Clinical Immunology
  • Pharmacology
  • Allergy and Immunology

Background:

  • Antibiotics are frequently administered perioperatively, accounting for 15% of anaphylactic reactions.
  • Anaphylaxis is commonly associated with penicillin and cephalosporin antibiotics.
  • Managing patients with reported antibiotic allergies is a frequent clinical challenge.

Purpose of the Study:

  • To outline the diagnostic approach for suspected antibiotic-induced anaphylaxis.
  • To emphasize the importance of allergological work-up for antibiotic hypersensitivity.
  • To guide the management of patients with a history of antibiotic allergic reactions.

Main Methods:

  • Diagnosis relies on a comprehensive allergological work-up, including detailed clinical history.
  • In vitro tests are insufficient; skin tests and drug provocation tests are crucial.
  • Assessing cross-reactivity between antibiotic classes like penicillins and cephalosporins is essential.

Main Results:

  • Immediate penicillin allergy diagnosis necessitates skin testing with alternative antibiotics (cephalosporin, carbapenem, aztreonam).
  • Negative skin tests allow for graded drug administration in a monitored setting.
  • This approach confirms or refutes the allergic nature of reported reactions.

Conclusions:

  • A rigorous allergological work-up is mandatory for diagnosing antibiotic hypersensitivity.
  • Skin testing and drug provocation are key to confirming or invalidating reported allergic reactions.
  • Careful evaluation enables safe re-administration of necessary antibiotics, considering cross-reactivity.