Patent ID: 7220430

Claim:
A sustained release preparation which comprises: a drug-containing core substance and a multilayered coating layer covering said core substance, wherein all adjacent layers in said multilayered coating layer contain mutually different hydrophobic organic compound-water-soluble polymer mixtures; and wherein said hydrophobic organic compound is one kind or two or more kinds selected from the group consisting of a higher fatty acid having 6 to 22 carbon atoms optionally having an unsaturated bond, a higher alcohol having 6 to 22 carbon atoms optionally having an unsaturated bond, a triglyceride of a higher fatty acid having 6 to 22 carbon atoms optionally having an unsaturated bond, and a natural fat and oil optionally hydrogenated, and said water-soluble polymer is one kind or two or more kinds selected from the group consisting of a water-soluble cellulose ether, a water-soluble vinyl derivative and an alkylene oxide polymer.