Systemic contact dermatitis following oral neomycin therapy

Area of Science:

• Dermatology
• Pharmacology
• Microbiology

Background:

• Systemic contact dermatitis (SCD) is a hypersensitivity skin reaction to systemic allergen re-exposure.
• Neomycin, an oral aminoglycoside antibiotic, is used preoperatively to reduce bowel infection risk.
• Common adverse effects of oral neomycin include gastrointestinal issues and colitis.

Observation:

• This report details a rare instance of systemic contact dermatitis.
• The reaction occurred after oral neomycin administration.
• Oral neomycin is typically poorly absorbed by the intestine.

Findings:

• Systemic contact dermatitis is an uncommon adverse reaction to oral neomycin.
• The case demonstrates a hypersensitivity response to neomycin despite poor intestinal absorption.
• This underscores the potential for unexpected drug reactions.

Implications:

• Clinicians should consider SCD in patients presenting with skin reactions after oral neomycin.
• Further investigation into the mechanisms of neomycin-induced SCD may be warranted.
• This case expands the known adverse event profile of oral neomycin.