Impeding the extraction of active ingredients out of tablets
Patent US6197314 (http://l2.espacenet.com/dips/viewer?PN=US6197314&CY=gb&LG=en&DB=EPD)
Abstract
Solid oral administration forms from which the active ingredients can be isolated only with difficulty are described and comprise, besides conventional ingredients, as addition a mixture of pharmacologically suitable fats or gel formers with surfactants. Addition of the mixtures impedes extraction of the active ingredients out of the administration forms.