Bacterial Eye Infection Treatment Guidelines

Antibiotic Therapy

• The American Academy of Ophthalmology recommends using Tobradex (tobramycin-dexamethasone) for bacterial keratitis requiring aggressive gram-negative coverage, due to its superior coverage against Pseudomonas aeruginosa and other gram-negative organisms 1
• Corticosteroids should only be added after 2-3 days of antibiotic therapy, once the organism is identified and the epithelial defect is healing, resulting in better visual acuity at 3 months 1

Treatment Timing and Considerations

• The American Academy of Ophthalmology advises against using combination steroid-antibiotic drops as initial monotherapy for suspected bacterial keratitis, and instead recommends starting with antibiotic-only therapy, then adding steroids once infection is controlled 1, 2
• Fungal keratitis must be ruled out before initiating corticosteroids, as steroid use is a risk factor for requiring penetrating keratoplasty in fungal infections 1

Antibiotic Usage and Monitoring

• The American Academy of Ophthalmology recommends not tapering antibiotics below subtherapeutic dosing, as this increases antibiotic resistance risk 2
• If no improvement occurs within 48 hours, therapy should be modified and reculture considered 2
• Prolonged antibiotic use can cause toxicity and should be tapered as infection improves 2