Controlled release composition comprising lactic acid...

A - Human Necessities – 61 – K

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A61K 38/09 (2006.01) A61K 47/12 (2006.01) A61K 47/34 (2006.01) A61P 5/06 (2006.01) A61P 15/00 (2006.01) A61P 35/00 (2006.01)

Patent

CA 2455392

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.

La présente invention se rapporte à une composition à libération contrôlée présentant une forte teneur en une substance physiologiquement active, supprimant la libération excessive initiale et assurant une vitesse de libération stable pendant une période de temps prolongée. La composition à libération contrôlée comprend (1) une substance physiologiquement active ou un sel d'une telle substance en quantité représentant environ 15 % en poids à environ 24 % en poids, par rapport au poids total de la composition, (2) de l'acide hydroxynaphtoïque sélectionné dans le groupe constitué par l'acide 3-hydroxy-2-naphtoïque et l'acide 1-hydroxy-2-naphtoïque ou un sel de ces derniers, et (3) un polymère d'acide lactique ou un sel dudit polymère ayant un poids moléculaire moyen en poids compris entre 15 000 et 50 000, la proportion des polymères ayant des poids moléculaires inférieurs ou égaux à 5000 étant inférieure ou égale à environ 5 % en poids et le rapport molaire dudit acide hydroxynaphtoïque ou de son sel à ladite substance physiologiquement active ou à son sel est compris entre 3:4 et 4:3.

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