An efficient ternary complex of acetazolamide with HP-ss-CD and TEA for topical ocular administration.
J Control Release
; 138(1): 24-31, 2009 Aug 19.
Article
en En
| MEDLINE
| ID: mdl-19426769
ABSTRACT
In order to enhance the ocular bioavailability of acetazolamide (ACZ), a multicomponent complex with hydroxypropyl-ss-cyclodextrin (HP-ss-CD) and triethanolamine (TEA) was prepared to be applied topically. In vitro corneal permeation across isolated rabbit cornea of proposed ACZ formulations and the marketed AZOPT(R) formulation (1% w/v brinzolamide) was studied. Formulations were also tested for their effect on the intraocular pressure (IOP) in rabbits. (1)H- and (13)C-NMR experiments were undertaken to verify the real inclusion of ACZ in the ACZ-HP-ss-CD-TEA multicomponent complex. The binding of ACZ to HP-ss-CD in the presence of TEA is described. The increase of TEA concentration decreases the apparent equilibrium constant for the ACZ-HP-ss-CD complex. The ternary system ACZ-HP-ss-CD-TEA seemed to be able to reduce IOP in about 30%. This effect was sustained for 4 h after instillation. In vitro corneal permeation studies demonstrated that the ACZ permeation was increased. RMN experiments indicated that TEA can weaken the association between ACZ and HP-ss-CD increasing the drug ocular hypotensive effect by increasing the free drug available for absorption. Our formulations were considered practically non-irritant. These results indicate that the ternary system ACZ-HP-ss-CD-TEA might be a useful tool for formulating aqueous ACZ eye drop solutions.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Inhibidores de Anhidrasa Carbónica
/
Córnea
/
Beta-Ciclodextrinas
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Etanolaminas
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Acetazolamida
Límite:
Animals
Idioma:
En
Revista:
J Control Release
Asunto de la revista:
FARMACOLOGIA
Año:
2009
Tipo del documento:
Article
País de afiliación:
Argentina