For fluoroquinolones in infectious corneal ulcers, what is the initial dosing regimen?

For fluoroquinolones in infectious corneal ulcers, what is the initial dosing regimen?

• A. Loading dose q5 min for 30 minutes, then q30 min
• B. Loading dose q15 min for 2 hours, then q2h
• C. Loading dose q15 min for 1 hour, then q1h thereafter
• D. Loading dose q1 hour for 4 hours, then q4h

Answer: (C)

Achieving high, immediate drug levels on the ocular surface is essential when treating infectious corneal ulcers with fluoroquinolones. The tear film is cleared quickly and bacteria in the cornea can proliferate fast, so starting with a rapid “loading” approach helps saturate the cornea with antibiotic right away and prevents subtherapeutic concentrations. Dosing every 15 minutes for the first hour delivers a high initial concentration, and continuing with one dose per hour afterward maintains those levels as healing begins. This strategy strikes a balance between rapid, effective coverage and practical dosing, reducing the risk of ongoing infection or resistance. Regimens that start with less frequent dosing early or extend very long intervals after the first hour risk leaving the surface under-treated during the critical initial period.

Achieving high, immediate drug levels on the ocular surface is essential when treating infectious corneal ulcers with fluoroquinolones. The tear film is cleared quickly and bacteria in the cornea can proliferate fast, so starting with a rapid “loading” approach helps saturate the cornea with antibiotic right away and prevents subtherapeutic concentrations. Dosing every 15 minutes for the first hour delivers a high initial concentration, and continuing with one dose per hour afterward maintains those levels as healing begins. This strategy strikes a balance between rapid, effective coverage and practical dosing, reducing the risk of ongoing infection or resistance. Regimens that start with less frequent dosing early or extend very long intervals after the first hour risk leaving the surface under-treated during the critical initial period.