New method for ophthalmic delivery of azithromycin by poloxamer/carbopol-based in situ gelling system.

Abstract:

:This study focused on preparation and evaluation of a thermosensitive and mucoadhesive in situ gelling ophthalmic system of azithromycin (ATM). Poloxamer 407 (P407) and poloxamer 188 (P188) were used as gelling agents. Addition of Carbopol 974P (CP 974P) to the gelling systems could increase the solubility of ATM by salt effect and enhance the mucoadhesive property of the systems. Gelation temperature of these systems ranged from 31.21-36.31 degrees C depending on the ratio of P407 and P188. Mucoadhesion force of the system composed of P407/P188/CP 974P (21/5/0.3%, w/v) was 2.3-fold that without carbopol 974P. Viscosity of the formulation was in a suitable range at 25 degrees C and pseudoplastic behavior was observed at 35 degrees C. The formulation exhibited a 24-h sustained release of ATM. In vivo resident experiments showed AUC(0-12) of ATM in rabbit tears increased by 1.78-fold for in situ gel compared with eye drop. At 12 h, tear concentrations exceeded minimum inhibitory concentration (MIC) breakpoint for the most common causative pathogens of bacterial conjunctivitis by 2.8-fold. Results in vitro and in vivo indicated that this droppable gel performed better than ATM eye drop did.

journal_name

Drug Deliv

journal_title

Drug delivery

authors

Cao F,Zhang X,Ping Q

doi

10.3109/10717544.2010.483255

subject

Has Abstract

pub_date

2010-09-01 00:00:00

pages

500-7

issue

7

eissn

1071-7544

issn

1521-0464

journal_volume

17

pub_type

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