Miconazole and Miconazolenitrate Chewing Gun as Drug Delivery Systems – A Practical Application of Solid Dispersion Technique

Abstract

Miconazole and miconazolenitrate are antifungal drugs with poor solubilities in water and saliva. The low solubilities meant that only small amounts of the drugs – incorporated by a conventional method in chewing gum-were released during mastication. The experiments were performed on a mastication device.In this study it was shown that application of a 20% miconazole – 80% polyethyleneglycol 6000 solid dispersion drastically improved the in vitro release of miconazole from cheving gum, when a medium similar to saliva was used. In addition to polyethyleneglycol 6000, polyvinylpyrrolidone 40000, xylitol and urea were tested as carriers. It was also shown that the release rate of miconazole from chewing gum was much greater than the release rate of miconazolenitrate.No certain correlation could be shown between the dissolution rates of the solid dispersions measured by a stirring paddle method and the release rates of miconazole from solid dispersions in chewing gum.The solid dispersion systems were characterized by differential scanning calorimetry. The systems containing polyethyleneglycol 6000 and xylitol were eutectic. Polyvinylpyrrolidone 40000 prevented crystallisation of miconazole when the percentage of drug in the solid dispersion was less than 50%.