Erythroderma due to ribostamycin.

Area of Science:

• Dermatology
• Clinical Immunology
• Pharmacology

Background:

• Aminoglycoside antibiotics, such as ribostamycin and neomycin, are widely used but can cause adverse reactions.
• Erythrodermic reactions are severe cutaneous manifestations that warrant thorough investigation.
• Identifying the causative agent is crucial for patient management and preventing future exposures.

Observation:

• A 48-year-old male presented with erythrodermia following intramuscular administration of ribostamycin.
• Patch testing revealed positive reactions to ribostamycin, neomycin, and mercurials.
• The absence of mercurial preservatives in the injection solution suggested a non-preservative-related mercury sensitivity.

Findings:

• Lymphocyte transformation tests confirmed hypersensitivity to ribostamycin and tobramycin, indicating cross-reactivity within the aminoglycoside class.
• The positive reaction to mercurials, despite their absence in the injection, suggests a potential co-existing or cross-reactive sensitivity.
• Structure-activity relationship analysis is discussed in the context of observed sensitivities.

Implications:

• This case underscores the importance of considering aminoglycoside hypersensitivity in patients presenting with severe cutaneous reactions post-administration.
• The findings highlight potential cross-reactivity between different aminoglycosides and possibly with mercurials, necessitating careful drug selection and allergy testing.
• Further investigation into structure-activity relationships can aid in predicting and preventing such adverse drug reactions.