Anaphylaxis after first exposure to ceftriaxone

Area of Science:

• Pediatric Allergy and Immunology
• Infectious Disease Management
• Pharmacovigilance

Background:

• Ceftriaxone is a common antibiotic used for severe infections.
• Anaphylaxis is a rare but serious allergic reaction.
• Early identification of drug hypersensitivity is crucial for patient safety.

Observation:

• A 5-year-old boy with septic shock developed life-threatening anaphylaxis within minutes of his first intravenous ceftriaxone dose.
• Standard allergy testing, including skin tests and IgE levels, did not indicate hypersensitivity.
• A controlled intravenous challenge definitively confirmed ceftriaxone-induced anaphylaxis.

Findings:

• Anaphylaxis can occur with the initial administration of ceftriaxone.
• Standard in vitro and skin tests may fail to detect ceftriaxone hypersensitivity.
• In vivo challenge is a reliable method for diagnosing ceftriaxone allergy.

Implications:

• Clinicians must consider the potential for anaphylaxis with first-dose ceftriaxone, even with negative initial tests.
• Anaphylactic reactions in critically ill patients may be masked by their underlying condition.
• Heightened awareness and diagnostic vigilance are necessary for safe antibiotic prescribing in vulnerable populations.