MULTILAYERED DOSING SYSTEMS

摘要

The invention relates to dosing systems which involve water-soluble or water dispersible products containing ingredients embedded within and/or coated upon a water-soluble film which are released at a prescribed rate into an aqueous environment through one or more perforated less readily soluble water-soluble films. The dosing system can be used for delivering pharmaceutical active ingredients externally or internally to a human or animal body, and can be embodied in the form of a patch that is applied to a site to be treated via a water soluble adhering layer (1) that adheres to the site with the ingredient(s) provided by a carrier layer (3) sandwiched between a perforated layer (2) for delivery of the ingredients to the site and a non-perforated protecting layer (4).