Enhanced ocular efficacy of topically-delivered dorzolamide with nanostructured mucoadhesive microparticles

Publication date: 30 April 2017 Source:International Journal of Pharmaceutics, Volume 522, Issues 1–2 Author(s): Chun Gwon Park, Young Kook Kim, Se-Na Kim, Seung Ho Lee, Beom Kang Huh, Min-A Park, Hyein Won, Ki Ho Park, Young Bin Choy Dorzolamide eye drops are widely prescribed to reduce intraocular pressure (IOP) in the treatment of ocular hypertension and glaucoma. However, in an eye drop formulation, dorzolamide is rapidly cleared from the preocular space, hence requiring multiple daily administrations. Here, we sought to increase the preocular retention of dorzolamide using nanostructured, mucoadhesive microparticles (MUCO_NM) as carriers for topical delivery to the eye. MUCO_NM were prepared by freeze-milling dorzolamide-loaded, electrospun nanofibers composed of poly(lactic-co-glycolic acid) and polyethylene glycol. The microparticles were embedded in a rapidly-dissolving tablet of polyvinyl alcohol. To assess in vivo efficacy, the MUCO_NM were administered topically to the eyes of rabbits, and IOP was measured and compared to that in eyes treated with Trusopt®, a marketed eye drop of dorzolamide. The MUCO_NM showed a 35% greater maximum IOP decrease and a>2-fold increase in the duration of the IOP decrease, compared to Trusopt®. This enhanced efficacy was comparable to that obtained with a single administration of 4 drops of Trusopt® or 2 administrations of Trusopt® at a 4-h interval. Our findings suggest that this MUCO_NM preparation is a promi...
Source: International Journal of Pharmaceutics - Category: Drugs & Pharmacology Source Type: research