Impact of antibiotics on smell dysfunction

Area of Science:

• Otolaryngology
• Infectious Diseases
• Pharmacology

Background:

• Respiratory infections frequently lead to persistent olfactory dysfunction.
• Antibiotic treatment is common for severe infections, but its impact on smell is not well understood.

Purpose of the Study:

• To investigate the effect of antibiotic use on olfactory function in patients with smell loss due to respiratory infections.
• To analyze odor identification and detection threshold scores in relation to antibiotic therapy.

Main Methods:

• Retrospective analysis of data from 288 patients at the University of Pennsylvania Smell and Taste Center.
• Evaluation of smell dysfunction secondary to upper respiratory infections (URIs), lower respiratory infections (LRIs), or rhinosinusitis.
• Comparison of olfactory test scores based on antibiotic use (bactericidal vs. bacteriostatic) and infection type.

Main Results:

• Patients with URI who received bactericidal antibiotics showed significantly lower (better) smell detection thresholds compared to non-antibiotic users (P < 0.023).
• Bactericidal antibiotic users had lower detection thresholds than bacteriostatic users for both URI (P = 0.023) and rhinosinusitis (P = 0.028) etiologies.
• No significant impact of antibiotic use was observed on odor identification test scores.

Conclusions:

• Bactericidal antibiotic therapy may offer some benefit in reducing chronic smell sensitivity deficits caused by URIs and rhinosinusitis.
• Further confirmation through prospective, double-blind studies is warranted.
• The findings suggest a potential therapeutic role for specific antibiotics in managing post-infectious smell loss.