Fixed exanthema from systemic tobramycin.

Area of Science:

• Ophthalmology
• Allergology
• Dermatology

Background:

• Ophthalmic medications in eye drops can cause allergic reactions.
• Aminoglycosides are commonly used antibiotics in eye care.
• Drug hypersensitivity reactions require careful clinical evaluation.

Observation:

• A patient presented with a history of contact dermatitis to neomycin.
• The patient also had a probable fixed drug exanthema following parenteral tobramycin.
• This suggested a potential hypersensitivity to aminoglycoside antibiotics.

Findings:

• Despite previous reactions, the patient tolerated topical tobramycin eye drops.
• The patient also tolerated other topical aminoglycoside ophthalmic solutions.
• This indicates potential differences in tolerance to topical versus systemic administration.

Implications:

• Topical aminoglycosides may be safely used in patients with a history of systemic reactions.
• Careful drug selection and administration routes are crucial in managing hypersensitivity.
• Further research is warranted to understand cross-reactivity and tolerance patterns.