Drug absorption behavior after periocular injections.

Abstract:

:The purpose of this study was to investigate the absorption behavior of an ophthalmic drug injected in rabbit periocular tissues. After intracapsular, retrobulbar and palpebral conjunctival injections of 150 microl and 50 microl fluorescein isothiocyanate dextran (FITC-dextran, average molecular weight 11000), leakage of the dye into the tear fluid was dependent on the injection route and volume. After periocular injections (50 microl) of tilisolol, as a model beta-blocker, the concentrations in the tear fluid, blood, aqueous humor and vitreous body were determined by HPLC. Slight drug leakage was observed in the tear fluid after injections. The periocular injections showed a faster absorption and a higher area under the concentration-time curve (AUC) in the plasma and a lower AUC in the aqueous humor than those observed in instillation. They also showed a higher ratio of AUC of tilisolol in the vitreous body to AUC in the aqueous humor than that observed in the instillation. Among the periocular injections, retrobulbar injection showed the highest concentrations in the plasma and the lowest in the aqueous humor and vitreous body, while intracapsular injection showed the lowest in the plasma and the highest in the aqueous humor and vitreous body. Although the periocular injections showed a rapid systemic absorption of drug by a rich topical vasculature, it might be an effective approach to deliver the drug to the periocular tissues and vitreous body.

journal_name

Biol Pharm Bull

authors

Sasaki H,Kashiwagi S,Mukai T,Nishida K,Nakamura J,Nakashima M,Ichikawa M

doi

10.1248/bpb.22.956

subject

Has Abstract

pub_date

1999-09-01 00:00:00

pages

956-60

issue

9

eissn

0918-6158

issn

1347-5215

journal_volume

22

pub_type

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