Abstract: A solid preparation includes a 4,5-epoxymorphinan derivative or a pharmaceutically acceptable acid addition salt thereof, which is stable to light even without light shielding coating. The solid preparation includes an active ingredient composed of a 4,5-epoxymorphinan derivative or a pharmaceutically acceptable acid addition salt thereof, and one or more stabilizing agents selected from the group consisting of n-propyl gallate, sodium hydrogensulfite, dibutylhydroxytoluene, butylhydroxyanisole, tocopherol and D-isoascorbic acid, wherein the amount of the above active ingredient is 0.00001 to 0.01% by weight of the solid preparation, and the amount of the above stabilizing agent is 0.005 to 5% by weight of the solid preparation.

Abstract: A tableted pharmaceutical composition contains nalfurafine or a pharmaceutically acceptable acid addition salt thereof and is excellent in formability and quality control of related substances. The tableted pharmaceutical composition includes nalfurafine or a pharmaceutically acceptable acid addition salt thereof, a binder component, and a carrier, wherein the above mentioned nalfurafine or a pharmaceutically acceptable acid addition salt thereof is contained in an amount of 0.1 to 10 ?g, and the weight of the above mentioned binder component is 100,000 to 2,000,000 weight % based on the weight of the above mentioned nalfurafine or a pharmaceutically acceptable acid addition salt thereof and 5 to 20 weight % based on the total weight of the resulting pharmaceutical composition, or 20,000 to 500,000 weight % and 1 to 5 weight % based on the total weight of the resulting pharmaceutical composition.

Abstract: A tableted pharmaceutical composition contains nalfurafine or a pharmaceutically acceptable acid addition salt thereof and is excellent in formability and quality control of related substances. The tableted pharmaceutical composition includes nalfurafine or a pharmaceutically acceptable acid addition salt thereof, a binder component, and a carrier, wherein the above mentioned nalfurafine or a pharmaceutically acceptable acid addition salt thereof is contained in an amount of 0.1 to 10 ?g, and the weight of the above mentioned binder component is 100,000 to 2,000,000 weight % based on the weight of the above mentioned nalfurafine or a pharmaceutically acceptable acid addition salt thereof and 5 to 20 weight % based on the total weight of the resulting pharmaceutical composition, or 20,000 to 500,000 weight % and 1 to 5 weight % based on the total weight of the resulting pharmaceutical composition.

Abstract: A solid preparation includes a 4,5-epoxymorphinan derivative or a pharmaceutically acceptable acid addition salt thereof, which is stable to light even without light shielding coating. The solid preparation includes an active ingredient composed of a 4,5-epoxymorphinan derivative or a pharmaceutically acceptable acid addition salt thereof, and one or more stabilizing agents selected from the group consisting of n-propyl gallate, sodium hydrogensulfite, dibutylhydroxytoluene, butylhydroxyanisole, tocopherol and D-isoascorbic acid, wherein the amount of the above active ingredient is 0.00001 to 0.01% by weight of the solid preparation, and the amount of the above stabilizing agent is 0.005 to 5% by weight of the solid preparation.

Abstract: In a system where phase separation into two phases occurs when an ether cellulose derivative (A), a polymer (B) different from the ether cellulose derivative (A), and an alcohol solvent (C) are mixed together, the two phases including a solution phase mainly containing the ether cellulose derivative (A) and a solution phase mainly containing the polymer (B), the two separated phases containing approximately the same solvent, an emulsion is formed and brought into contact with a poor solvent (D) to provide an ether cellulose derivative microparticle having an average particle diameter of 1 to 1,000 ?m, a linseed oil absorption of 50 to 1,000 mL/100 g, and an average surface pore size of 0.05 to 5 ?m.

Abstract: A chemically stable oral preparation with an excellent dissolution property comprising as an effective ingredient a specific morphinan derivative or a pharmaceutically acceptable acid addition salt thereof is disclosed. The oral preparation according to the present invention comprises a specific morphinan derivative or a pharmaceutically acceptable acid addition salt thereof as an effective ingredient and an organic acid, wherein 1 g of said organic acid requires not less than 30 mL of water to dissolve in at 20° C. The method for improving dissolution property and chemical stability of an oral preparation according to the present invention comprises incorporating an organic acid in the oral preparation comprising as an effective ingredient a specific morphinan derivative or a pharmaceutically acceptable acid addition salt thereof, wherein 1 g of said organic acid requires not less than 30 mL of water to dissolve in at 20° C.

Abstract: A chemically stable oral preparation with an excellent dissolution property comprising as an effective ingredient a specific morphinan derivative or a pharmaceutically acceptable acid addition salt thereof is disclosed. The oral preparation according to the present invention comprises a specific morphinan derivative or a pharmaceutically acceptable acid addition salt thereof as an effective ingredient and an organic acid, wherein 1 g of said organic acid requires not less than 30 mL of water to dissolve in at 20° C. The method for improving dissolution property and chemical stability of an oral preparation according to the present invention comprises incorporating an organic acid in the oral preparation comprising as an effective ingredient a specific morphinan derivative or a pharmaceutically acceptable acid addition salt thereof, wherein 1 g of said organic acid requires not less than 30 mL of water to dissolve in at 20° C.

Abstract: A cross-linked polyallylamine or an acid addition salt thereof has both high phosphate adsorption capability and low degree of swelling, and a medical use thereof. The cross-linked polyallylamine or an acid addition salt thereof is obtained by copolymerization of allylammonium dihydrogen phosphate with an acid addition salt of N,N?-diallyl-1,3-diaminopropane in an amount of 5 to 25 mol % with respect to the amount of the allylammonium dihydrogen phosphate, the cross-linked polyallylamine or an acid addition salt thereof having a phosphate adsorption capacity of 2.7 to 5.0 mmol/g; and a degree of swelling of 2.0 to 5.0. The cross-linked polyallylamine or an acid addition salt thereof is useful as a therapeutic or prophylactic agent for hyperphosphatemia.