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In this episode, host Alyssa Watson, DVM, is joined by Shannon D. Boveland, DVM, MS, DACVO, to talk about her recent Clinician’s Brief article, “Quiz: Ophthalmic Medications—Ointments vs Drops.” Dr. Boveland breaks down the differences between various drops and ointments and explains how to make the right selection from your shelves full of options. She also shares some specific tips about feline conjunctivitis, corneal ulcers, and contact lenses.
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Key Takeaways
Meds that are solutions (smaller particles, completely dissolved) are rapidly available, can penetrate better, but have a shorter duration, whereas suspensions (larger particles, not dissolved) are slightly slower but last longer, and ointments (suspensions in oil/based vehicle) stay on the ocular surface the longest.
The ocular condition being treated as well as client/pet compliance all impact selection, e.g., an ointment requires less frequent application but is not appropriate for a deep, possibly perforated ulcer.
Systemic absorption of ophthalmic medication is usually insignificant, though some can lead to systemic effects.
Topical NSAIDs and topical steroids are OK to use together, and one can be used topically while the other is used systemically, but neither are good topical choices for corneal ulcers.
Though anaphylaxis from ophthalmic polymyxin B in cats seems quite rare, it has been reported, and erythromycin can be used as a safe and effective alternative in feline conjunctivitis cases.
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The Team:
Alyssa Watson, DVM - Host
Alexis Ussery - Producer & Multimedia Specialist