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Methotrexate Delivery to the Eye Using Transscleral Hydrogel Iontophoresis 

Authors: Esther Eljarrat-Binstock a;  Abraham J. Domb a;  Faik Orucov b;  Joseph Frucht-Pery b; Jacob Pe'er b
Affiliations:   a Department of Medicinal Chemistry and Natural Products, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
b Department of Ophthalmology, Hadassah Hebrew University Medical Center, Jerusalem, Israel
DOI: 10.1080/02713680701528674
Publication Frequency: 12 issues per year
Published in: journal Current Eye Research, Volume 32, Issue 7 & 8 July 2007 , pages 639 - 646
First Published on: 01 July 2007
Subject: Ophthalmology;
Formats available: HTML (English) : PDF (English)
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Abstract

Purpose: To evaluate methotrexate penetration and distribution profile in ocular structures after short low current transscleral hydrogel iontophoresis. Methods: Methotrexate iontophoresis was studied in rabbits using drug-loaded hydrogels mounted on a portable iontophoretic device. Drug distribution profile was evaluated 2, 4, and 8 hours after iontophoretic treatment of 1.6 mA/cm2 for 4 min. Ocular drug levels were also determined two hours after iontophoretic treatment of 5 mA/cm2, compared to mock iontophoresis and intravitreal injection of methotrexate. Results: Therapeutic drug levels were maintained for at least 8 h at the sclera and retina and for 2 h at the aqueous humor following the iontophoretic treatment. After increasing the current density, a twice-higher concentration was achieved at the vitreous and 8 to 20 time higher concentrations at the retina and sclera.Conclusions: A short low current non-invasive iontophoretic treatment using methotrexate-loaded hydrogels has a potential clinical value in treating ocular inflammatory diseases and intraocular lymphoma.
Keywords: Hydrogel; iontophoresis; methotrexate; lymphoma; uveitis
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