Journal
BIOMATERIALS
Volume 22, Issue 13, Pages 1763-1769Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0142-9612(00)00336-7
Keywords
pHEMA hydrogel; pilocarpine; drug delivery system; drug release; glaucoma
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This work investigates pilocarpine trapped in a matrix diffusion-controlled drug delivery system using hydrophilic inserts of Poly(2-hydroxyethyl methacrylate) (pHEMA) to ensure an increased bioavailability of pilocarpine and prolong the length of time in which the medication remains in the eyes of the test subjects. The physical and chemical properties of pilocarpine were investigated to elucidate the mechanism of drug-polymer interaction and the effect on drug release behavior of controlled release polymeric devices. In vitro release studies indicated that pilocarpine continued to be released from the inserts for a 24 h period. The results of intraocular pressure tests performed on albino rabbits were consistent with the observed in vitro behavior. The pressure decrease was significant for a period longer than 48 h. It confirms that the inserts, as sustainable releasing devices, are promising carriers for ophthalmic drug delivery systems. (C) 2001 Elsevier Science Ltd. All rights reserved.
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