Process for producing oral dosage forms with controlled release

A process for producing solid oral dosage forms with controlled active ingredient release, comprising a mixture of:

• a) at least one active ingredient, and
• b) a preformulated mixture of polyvinyl acetate and polyvinylpyrrolidone;
• wherein the mixture is obtained by joint processing of components a) and b) in an extruder at temperatures between 80° and 180° C.;
• wherein said preformulated mixture is obtained by dissolving polyvinylpyrrolidone in a fine-particle aqueous dispersion of polyvinyl acetate with a particle size of the polyvinyl acetate particles of from 100 to 300 nm, and subsequently spray driving;
• and wherein extrusion takes place under a pressure of from 2 to 25 MPa;
• wherein a film with a layer thickness of 100-1000 μm is extruded, from which small pieces of film for oral administration are cut out directly thereafter.