March 1984
Volume 25, Issue 3
Articles  |   March 1984
Drug reservoirs in topical therapy.
Investigative Ophthalmology & Visual Science March 1984, Vol.25, 346-350. doi:
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      J S Mindel, H Smith, M Jacobs, A B Kharlamb, A H Friedman; Drug reservoirs in topical therapy.. Invest. Ophthalmol. Vis. Sci. 1984;25(3):346-350.

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      © ARVO (1962-2015); The Authors (2016-present)

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The nictitating membrane, corneal epithelium, and corneal stroma were investigated as drug reservoirs. A hydrophilic drug, D,L-epinephrine HCl, or a lipophilic drug, chloramphenicol, was applied topically to rabbit eyes. Tissue levels of radioactive drug-plus-metabolites and unmetabolized epinephrine were assayed up to 24 hrs later. On a per-mg-tissue basis, concentrations of epinephrine-plus-metabolites in the stroma-endothelium were similar to or higher than those in the epithelium. The percentages of radioactivity representing unmetabolized epinephrine in the stroma-endothelium were found to be similar to or higher than those in the epithelium. On a per-mg-tissue basis, concentrations of chloramphenicol-plus-metabolites were significantly higher in the epithelium than in the stroma-endothelium during the first 130 min after drug application. While the physical properties of these drugs determined whether a higher concentration was found in the epithelium or stroma-endothelium, the ninefold greater mass of the stroma-endothelium made it the major drug reservoir on a per-whole-tissue basis. The presence or absence of a nictitating membrane had little effect on the level of either drug in the epithelium, stromal-endothelium, or aqueous humor.


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