Which statement about combination options for ocular antibiotics is correct?

Which statement about combination options for ocular antibiotics is correct?

• A. Cefazolin + Ofloxacin
• B. Cefazolin + Gentamicin or Tobramycin
• C. Make sure the formulation does not contain steroids
• D. Use of steroids in antibiotic formulations

Answer: (C)

The key principle here is avoiding steroids in topical antibiotic formulations when an active ocular infection is present. Steroids can dampen the immune response and slow healing, which can allow bacteria to persist or spread. In the equine eye, this is especially important with corneal ulcers and infectious keratitis, where rapid bacterial clearance and epithelial healing are critical. Steroids can also mask clinical signs and, in some cases, increase the risk of fungal keratitis or other complications. Therefore, using an antibiotic formulation that does not contain steroids helps ensure the infection is treated aggressively rather than suppressed. While combining antibiotics (for broader coverage) is common, the safety and healing implications of adding steroids make the steroid-free option the best general rule during active infection. Conversely, including steroids in an antibiotic preparation is not appropriate when infection is present, since it can hinder recovery.

The key principle here is avoiding steroids in topical antibiotic formulations when an active ocular infection is present. Steroids can dampen the immune response and slow healing, which can allow bacteria to persist or spread. In the equine eye, this is especially important with corneal ulcers and infectious keratitis, where rapid bacterial clearance and epithelial healing are critical. Steroids can also mask clinical signs and, in some cases, increase the risk of fungal keratitis or other complications. Therefore, using an antibiotic formulation that does not contain steroids helps ensure the infection is treated aggressively rather than suppressed.

While combining antibiotics (for broader coverage) is common, the safety and healing implications of adding steroids make the steroid-free option the best general rule during active infection. Conversely, including steroids in an antibiotic preparation is not appropriate when infection is present, since it can hinder recovery.