Provided is an enteric-coated preparation comprising an enteric coating material capable of delivering a drug to a site within the small intestine in a site-specific manner. More specifically, provided is an enteric-coated preparation for delivering a drug to a site within the small intestine in a site-specific manner, comprising a drug-containing preparation and an enteric coating material which covers the preparation, wherein, in Dissolution Test as specified in the Japanese Pharmacopoeia Fourteenth Edition, no dissolution of the drug is observed in the Japanese Pharmacopoeia first fluid (pH 1.2) while dissolution of the drug is observed in the Japanese Pharmacopoeia second liquid (pH 6.8) 20 minutes or later from start of the Dissolution Test. The enteric coating material is preferably selected from the group consisting of hydroxypropylmethyl cellulose acetate succinate, hydroxypropylmethyl cellulose phthalate, methacrylic acid copolymer and carboxymethylethyl cellulose.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates the dissolution profile in Japanese Pharmacopoeia second fluid;
FIG. 2 illustrates the dissolution profile in a phosphate buffer having a pH of 7.6;
FIG. 3 illustrates the profile of the blood level in Example 1; and
FIG. 4 illustrates the profile of the blood level in Example 3.
Claims
1. An enteric-coated preparation for delivering a drug to a site within the small intestine in a site-specific manner, comprising a drug-containing preparation and an enteric coating material which covers the preparation,
2. The enteric-coated preparation according to claim 1, wherein the enteric coating material is selected from the group consisting of hydroxypropylmethyl cellulose acetate succinate, hydroxypropylmethyl cellulose phthalate, methacrylic acid copolymer and carboxymethylethyl cellulose.
3. The enteric-coated preparation according to claim 2, wherein the enteric coating materiel is hydroxypropylmethyl cellulose acetate succinate having a succinoyl group content of 0.1 to 10% by weight, or methacrylic acid copolymer having a methacrylic acid content of 25 to 34.5% by weight.
4. The enteric-coated preparation according to claim 2, wherein the enteric coating material is hydroxypropylmethyl cellulose acetate succinate having a succinoyl group content of 0.1 to 10% by weight, an acetyl group content of 5 to 14% by weight, and keeping a ratio of the acetyl group content to the succinoyl group content from 1.25 to 5.
Patent Application
20070196399
