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In page Corneal abrasion:

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If the mechanism of injury involves contact lenses, fingernails or organic/ plant matter, antibiotic prophylaxis should be provided with topical fluoroquinolone drops 4 times a day, and a fluoroquinolone ointment, typically ciprofloxacin, at night. If the abrasion was caused by another mechanism, the recommended treatment includes antibiotic ointments (erythromycin, bacitracin or bacitracin/polymyxin B every 2 or 4 hours) or antibiotic drops, usually polymyxin B and trimethoprim 4 times a day.[citation needed]