Patent ID: 6110500
Filing Date: 2000-08-29
Classification: A61K

Abstract:
A tablet for the controlled release of a pharmaceutically active ingredient, said tablet comprising:a donut-shaped core material with a cylindrical hole extending through the center of said core, said core comprising at least one pharmaceutically active ingredient dispersed in at least one hydrophilic, polymeric carrier which is water-soluble at body temperature, has a molecular weight from 8,000 to 300,000, and is selected from the group consisting of hydroxypropylmethylcellulose; polyethylene oxide; polyethylene glycol; hydroxypropyl cellulose; hydroxyethylcellulose; cyclodextrin; and cyclodextrin derivatives; anda coating of hydrophobic, water-insoluble material covering all of said core except the surface of said core surrounding said cylindrical hole.