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Evaluation of the Penetration of Fluoroquinolones in Human Conjunctival Tissue
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Wagner et al1 described the penetration of topical fluoroquinolones into conjunctival tissue and concluded that efficacy relies primarily on structure, mechanism of action, and penetration into the intended site of action, thereby providing "greater efficacy and more expedient elimination of bacteria."1 They concluded that their study gives a new dual-biopsy technique that may become "a universally approved, standardized means of evaluating topical ocular antibiotics."1 However, measuring antibiotic concentrations in the conjunctiva is only 1 of many ways to measure the efficacy of topical antibiotics.
Although conjunctival and corneal tissue antibiotic concentrations are important factors in determining antibiotic efficacy, one must also take into consideration minimum inhibitory concentrations, tolerability, and toxicity.
Ciprofloxacin achieved high conjunctival concentrations. However, probably related to its low pH (pH 4.5), ciprofloxacin precipitated on the cornea in 15.2% of patients with bacterial keratitis and slowed reepithelialization by 55%.2 Ciprofloxacin's minimum inhibitory concentrations are not as low as . . . [Full Text of this Article] AUTHOR INFORMATION
Richard G. Fiscella, RPh, MPH;
Michael K. Jensen, RPh, MBA
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Evaluation of Moxifloxacin, Ciprofloxacin, Gatifloxacin, Ofloxacin, and Levofloxacin Concentrations in Human Conjunctival Tissue
Rudolph S. Wagner, Mark B. Abelson, Aron Shapiro, and Gail Torkildsen
Arch Ophthalmol. 2005;123(9):1282-1283.
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Evaluation of the Penetration of Fluoroquinolones in Human Conjunctival TissueReply
Rudolph S. Wagner
Arch Ophthalmol. 2006;124(12):1797.
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