Details for Patent: 7,429,559
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Title: | Controlled release composition and method of producing the same |
Abstract: | A controlled release composition containing a physiologically active substance in high content, suppressing the initial excess release, and achieving a stable release speed over a long period of time is provided. A controlled release composition comprising (1) a physiologically active substance or salt thereof in an amount of about 14% (w/w) to about 24% (w/w) based on the total composition weight, (2) hydroxynaphthoic acid selected from the group consisting of 3-hydroxy-2-naphthoic acid and 1-hydroxy-2-naphthoic acid or salt thereof, and (3) a lactic acid polymer or salt thereof having a weight-average molecular weight of 15000 to 50000 in which the content of polymers having molecular weights of 5000 or less is about 5% by weight or less, wherein the molar ratio of said hydroxynaphthoic acid or salt thereof to said physiologically active substance or salt thereof is from 3:4 to 4:3. |
Inventor(s): | Yamamoto; Kazumichi (Kyoto, JP), Yamada; Akiko (Kyoto, JP), Hata; Yoshio (Hokkaido, JP) |
Assignee: | Takeda Pharmaceutical Company Limited (Osaka, JP) |
Filing Date: | Jun 28, 2002 |
Application Number: | 10/182,731 |
Claims: | 1. A controlled release composition comprising a physiologically active substance or salt thereof, and a lactic acid polymer or salt thereof having a weight-average molecular weight of 15000 to 50000 in which the content of polymers having molecular weights of 5000 or less is about 5% by weight or less. 2. The controlled release composition according to claim 1, comprising (1) a physiologically active substance or salt thereof in an amount of about 3% (w/w) to about 24% (w/w) based on the total composition weight, and (2) a lactic acid polymer or salt thereof having a weight-average molecular weight of 15000 to 50000 in which the content of polymers having molecular weights of 5000 or less is about 5% by weight or less. 3. The controlled release composition according to claim 1 wherein the lactic acid polymer has a content of polymers having molecular weights of 3000 or less is about 1.5% by weight or less. 4. The controlled release composition according to claim 1 wherein the lactic acid polymer has a content of polymers having molecular weights of 1000 or less is about 0.1% by weight or less. 5. The controlled release composition according to claim 1 wherein the lactic acid polymer has a weight-average molecular weight of 15000 to 40000. 6. The controlled release composition according to claim 1 wherein the lactic acid polymer has a weight-average molecular weight of 17000 to 26000. 7. The controlled release composition according to claim 1 wherein the physiologically active substance is a physiologically active peptide. 8. The controlled release composition according to claim 7 wherein the physiologically active substance is a LH-RH derivative. 9. The controlled release composition according to claim 8 wherein the LH-RH derivative or salt thereof is contained in an amount of 3% (w/w) to 24% (w/w) in the controlled release composition. 10. The controlled release composition according to claim 1 which is used for injection. |