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April 1977

Drug Interaction in the EyeConcurrent Corticosteroid-Antibiotic Therapy for Inflammatory Keratitis

Arch Ophthalmol. 1977;95(4):682-685. doi:10.1001/archopht.1977.04450040148023

• Concurrent instillation of individual preparations of a corticosteroid and an antibiotic resulted in significantly (P <.05) lower peak corneal and aqueous humor steroid levels than those achieved by the steroid alone. Both the interval elapsing between instillation of the two drugs and the sequence in which they were administered influenced subsequent steroid bioavailability. Corticosteroid levels in the cornea after administration of a combination steroid-antibiotic preparation were not significantly different (P <.05) from those detected after instillation of the same steroid alone, suggesting that, for the treatment of corneal disorders, use of a combination preparation may offer a method to circumvent certain drug interactions. The decrease in ocular steroid bioavailability could not be directly equated with differences in antiinflammatory effectiveness, so that the therapeutic relevance of the demonstrated drug interaction is not known.

(Arch Ophthalmol 95:682-685, 1977)