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Abstract
A buccoadhesive system for the delivery of oxycodone hydrochloride to the oral mucosa was prepared from a colloidal solution of gelatin used as a bioadhesive agent. An in vitro method for measuring the adhesion of release system to a substrate was developed by employing a modified balance. The eflects of thickness and of the presence of the drug on swelling and mucoadhesion properties were evaluated. The in vitro release of the buccoadhesive formulation was studied by a USP paddle dissolution apparatus and the results were fitted to an empirical equation. In vivo compliance and permanence time in 10 healthy volunteers were estimated.