[Liberation of active agents from coherent emulsions]

Drug release from coherent emulsions containing high water concentration (50-80 w/w%) was studied. Composition of coherent systems was as follows: self-emulsifying wax and preserved water. Griseofulvin was applied as active agent in suspended form. The liberation experiments were carried out with Hanson vertical diffusion cell, acceptor phase was distilled water, membrane was celophane one. It was established that the time course of liberation of griseofulvin from coherent emulsions can be characterized with a multiplicative function and the exponent of this function is about 0.5. The quantity of released drug increased linearly with the water content and it decreased exponentially with the viscosity of coherent emulsions.