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Gentamicin: systemic exposure to a contact allergen.
1Division of Dermatology, University of Toronto.
Journal of the American Academy of Dermatology
|August 1, 1988
Summary
Allergic dermatitis can occur from intravenous gentamicin after prior topical exposure. Patch tests confirmed hypersensitivity, highlighting cross-reactions between aminoglycoside antibiotics.
Area of Science:
- Dermatology
- Pharmacology
- Allergology
Background:
- Topical medications can sensitize patients to systemic antibiotics.
- Aminoglycoside antibiotics are frequently used for bacterial infections.
- Allergic reactions to antibiotics can range from mild to severe.
Observation:
- A patient developed allergic dermatitis following intravenous gentamicin administration.
- Previous topical exposure to gentamicin or related compounds was noted.
- Patch testing was performed to identify the specific allergen.
Findings:
- Patch tests confirmed hypersensitivity to gentamicin.
- Cross-reactivity between gentamicin and neomycin was identified.
- The case illustrates systemic allergic reactions to topical sensitizers.
Implications:
- Clinicians should consider prior topical exposure when evaluating antibiotic allergies.
- Understanding cross-reactivity patterns is crucial for safe antibiotic prescribing.
- This case highlights the importance of patch testing in diagnosing drug hypersensitivity.