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Development and Characterization of a Tacrolimus/Hydroxypropyl-β-Cyclodextrin Eye Drop
oleh: Xurxo García-Otero, Victoria Díaz-Tomé, Rubén Varela-Fernández, Manuel Martín-Pastor, Miguel González-Barcia, José Blanco-Méndez, Cristina Mondelo-García, Maria A. Bermudez, Francisco Gonzalez, Pablo Aguiar, Anxo Fernández-Ferreiro, Francisco J. Otero-Espinar
Format: | Article |
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Diterbitkan: | MDPI AG 2021-01-01 |
Deskripsi
Uveitis is a vision inflammatory disorder with a high prevalence in developing countries. Currently, marketed treatments remain limited and reformulation is usually performed to obtain a tacrolimus eye drop as a therapeutic alternative in corticosteroid-refractory eye disease. The aim of this work was to develop a mucoadhesive, non-toxic and stable topical ophthalmic formulation that can be safely prepared in hospital pharmacy departments. Four different ophthalmic formulations were prepared based on the tacrolimus/hydroxypropyl-β-cyclodextrin (HPβCD) inclusion complexes’ formation. Phase solubility diagrams, Nuclear Magnetic Resonance (NMR) and molecular modeling studies showed the formation of 1:1 and 1:2 tacrolimus/HPβCD inclusion complexes, being possible to obtain a 0.02% (<i>w/v</i>) tacrolimus concentration by using 40% (<i>w/v</i>) HPβCD aqueous solutions. Formulations also showed good ophthalmic properties in terms of pH, osmolality and safety. Stability studies proved these formulations to be stable for at least 3 months in refrigeration. Ex vivo bioadhesion and in vivo ocular permanence showed good mucoadhesive properties with higher ocular permanence compared to the reference pharmacy compounding used in clinical settings (<i>t<sub>1/2</sub></i> of 86.2 min for the eyedrop elaborated with 40% (<i>w/v</i>) HPβCD and Liquifilm<sup>®</sup> versus 46.3 min for the reference formulation). Thus, these novel eye drops present high potential as a safe alternative for uveitis treatment, as well as a versatile composition to include new drugs intended for topical ophthalmic administration.