Sustained ocular drug delivery from a temperature and pH triggered novel in situ gel system.

Abstract:

:Various ocular diseases like glaucoma, conjunctivitis, and dry eye syndrome require frequent drug administration. Poor ocular bioavailability of drugs (< 1%) from conventional eye drops is due mainly to the precorneal loss factors that include rapid tear turnover, nonproductive absorption, transient residence time in the cul-de-sac, and the relative impermeability of the drugs to corneal epithelial membrane. These problems may be overcome by the use of in situ gel-forming systems that are instilled as drops into the eye and undergo a sol-gel transition in the cul-de-sac. Our present work describes the formulation and evaluation of an ocular delivery system of timolol maleate based on the concept of both temperature and pH-triggered in situ gelation. Pluronic F-127 (a thermosensitive polymer) in combination with chitosan (pH-sensitive polymer also acts as permeation enhancer) was used as gelling agent. The developed formulation was characterized for various in vitro parameters e.g., clarity, gelation temperature and pH, isotonicity, sterility, rheological behavior, drug release profile, transcorneal permeation profile, and ocular irritation. Developed formulation was clear, isotonic solution, that converted into gel at temperatures above 35 degrees C and pH 6.9-7.0. A significant higher drug transport across corneal membrane and increased ocular retention time was observed using the developed formulation. The developed system is a viable alternative to conventional eye drops for the treatment of glaucoma and various other ocular diseases.

journal_name

Drug Deliv

journal_title

Drug delivery

authors

Gupta H,Jain S,Mathur R,Mishra P,Mishra AK,Velpandian T

doi

10.1080/10717540701606426

subject

Has Abstract

pub_date

2007-11-01 00:00:00

pages

507-15

issue

8

eissn

1071-7544

issn

1521-0464

pii

785909310

journal_volume

14

pub_type

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