Clinical Equine Ophthalmology Practice Test

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Which antibiotic is a 4th generation fluoroquinolone used for ocular infections?

Chloramphenicol

Terramycin

Triple/BNP

Moxifloxacin

Moxifloxacin is a fourth-generation fluoroquinolone, chosen for ocular infections because it combines broad-spectrum activity with strong coverage of Gram-positive bacteria and excellent penetration into ocular tissues. This makes it effective against common ocular pathogens and reliable in reaching therapeutic levels in the cornea and conjunctiva after topical administration. Other options come from different antibiotic classes: chloramphenicol is not a fluoroquinolone, terramycin is tetracycline, and Triple/BNP is a polymyxin B–bacitracin–neomycin combination.