Periocular Tissue Concentrations of Propranolol after Ocular Instillation of a Gel-Forming Solution

Author(s): Michael B. Yang, Hongzhuo Liu, S. Kevin Li, Jinsong Hao.

Journal Name: Current Drug Delivery

Volume 13 , Issue 7 , 2016

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Abstract:

Background: The aim of this study was to determine the concentrations of propranolol in periocular tissues and plasma after ocular instillation of 0.5% propranolol gel-forming solution (GFS) as compared to 0.5% propranolol non-gelforming solution (non-GFS) for potential use in the treatment of periocular capillary hemangiomas.

Methods: A GFS prepared in 1% sodium alginate or a non-GFS in phosphatebuffered saline was instilled into the eyes of rabbits. At predetermined time intervals after dosing, blood was withdrawn, rabbits were euthanized, and periocular tissues were dissected.

Results: Ocular instillation of the GFS resulted in higher concentrations of propranolol in the outer layers of both the upper and lower eyelids (in the range of 9.9-36.9 μg/g) and maintained higher levels of propranolol in these tissues for 24 h after dosing, as compared to the ocular instillation of the non-GFS (in the range of 3.4-15.1 μg/g). While the concentrations of propranolol in the other periocular tissues were generally similar for GFS and non-GFS at 1 h after dosing, the concentrations of propranolol in the extraocular muscles and periocular fat were higher for GFS than those for non-GFS between 4-24 h after dosing. Lower level of propranolol in plasma was observed at 1 h with GFS as compared with non-GFS.

Conclusion: The use of the propranolol gel-forming solution can prolong drug retention on the ocular surface and increase its distribution to the outer layers of the eyelids while decreasing systemic exposure to the drug.

Keywords: Distribution, hemangioma, ocular instillation, ophthalmic gel-forming solution, periocular tissue, propranolol.

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Article Details

VOLUME: 13
ISSUE: 7
Year: 2016
Page: [1144 - 1151]
Pages: 8
DOI: 10.2174/1567201813666151215092929
Price: $58

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