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Cefazolin tolerance does not predict ceftriaxone hypersensitivity: unique side chains precipitate anaphylaxis.

Sara A Poston¹, Heath R Jennings, Kevin L Poe

¹College of Pharmacy, University of Kentucky, Lexington, Kentucky, USA.

Pharmacotherapy

|May 28, 2004

Summary

A patient experienced anaphylaxis after reexposure to ceftriaxone, despite initial tolerance to cefazolin. Skin testing identified the ceftriaxone R2 side chain as the likely allergen, not the beta-lactam ring.

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Area of Science:

Clinical Immunology
Pharmacology
Infectious Diseases

Background:

Cephalosporin antibiotics are widely used, but allergies can complicate treatment.
Accurate allergy assessment is crucial for safe antibiotic selection, especially in patients with a history of hypersensitivity.

Observation:

A patient with a questionable ceftriaxone allergy tolerated cefazolin but later developed anaphylaxis upon receiving intravenous ceftriaxone.
Symptoms included angioedema, laryngopharyngeal constriction, dyspnea, hypotension, and tachycardia, resolving with standard anaphylaxis treatment.

Findings:

Skin testing indicated the ceftriaxone R2 side chain, not the beta-lactam ring, was the likely antigenic determinant.
This suggests specific side chains, rather than the core structure, can mediate IgE-mediated hypersensitivity to cephalosporins.

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Implications:

Misconceptions about cephalosporin allergies can lead to dangerous reexposure and anaphylaxis.
Understanding specific allergenic determinants is vital for clinicians to prevent Type 1 hypersensitivity reactions in at-risk patients.