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October 1974

Ocular Penetration in Rabbits of Topically Applied Dexamethasone

Author Affiliations

From the Department of Ophthalmology and the Oscar Johnson Institute, Washington University School of Medicine, St. Louis.

Arch Ophthalmol. 1974;92(4):312-314. doi:10.1001/archopht.1974.01010010322012

In rabbits, topical application of tritium-labelled 0.1% dexamethasone sodium phosphate (Decadron) with a high specific activity resulted in easily detectable corneal and aqueous humor levels of this corticosteroid. Thin-layer chromatography (TLC) on aqueous humor samples demonstrated the tritium label on the dexamethasone molecule. Differential staining after TLC confirmed the presence of dexamethasone sodium phosphate in the aqueous humor samples. Using application of lower specific activity, dexamethasone resulted in an apparent lack of penetration because of the limits of this method.