| abstract |
It is intended to disclose preparation compositions which enable convenient production of sustained-release preparation compositions containing acid-unstable physiologically active compounds and have the desired sustained-release properties. Namely, preparation compositions comprising a core containing an acid-unstable physiologically active compound and a film with which the core is coated and which contains a mixture of a water-insoluble polymer with an enteric polymer. These preparation compositions make it possible to maintain an effective concentration in blood of the physiologically active compound over a long time, thereby improving its therapeutic effect. Moreover, these compositions remain stable over prolonged storage. |