Process for the selective increase of a release rate of an...

A - Human Necessities – 61 – K

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Details

A61K 9/20 (2006.01) A61K 47/14 (2006.01) A61K 47/36 (2006.01)

Patent

CA 2563829

The present invention provides a process for a selective increase of a release rate in a later stage of the release period of an active material from a controlled release pharmaceutical composition comprising an active material and a lipid material embedding said active material, comprising the step of: adding a swellable organic disintegrant selected from the group consisting of potato starch, maize starch, wheat starch, tapioca starch, pregelatinized starch, physically modified amylose, modified potato starch, amylopectin, sodium starch glycolate, sodium amylopectin glycolate, croscarmellose sodium, carmellose calcium, calcium alginate, crosslinked dextran and formaldehyde- casein, in an amount of 3 to 20 percent by weight, based on the entire weight of the controlled release pharmaceutical composition, to a lipophilic matrix comprising an active material embedded in a lipid material; and a controlled release pharmaceutical composition having such a modified release profile comprising an active material, a lipid material embedding said active material, and a swellable organic disintegrant mentioned above, in an amount of 3 to 20 percent by weight.

L'invention concerne un procédé d'augmentation sélective de la vitesse de libération au cours de la dernière phase de la période de libération d'une substance active contenue dans une composition pharmaceutique à libération contrôlée qui contient une substance active renfermant une substance lipidique Ce procédé consiste à ajouter un délitant organique capable de gonfler sélectionné dans le groupe constitué par la fécule de pomme de terre, la fécule de maïs, l'amidon de blé, l'amidon de manioc, l'amidon prégélatinisé, l'amylose physiquement modifié, l'amidon de pomme de terre modifié, l'amylopectine, le glycolate d'amidon sodique, le glycolate d'amylopectine sodique, le croscarmellose sodique, le carmellose calcium, l'alginate de calcium, le dextrane et le formaldéhyde-caséine réticulés, dans des proportions comprises entre 3 et 20 % en poids, sur la base du poids total de la composition pharmaceutique à libération contrôlée, à une matrice lipophile qui contient une substance active encapsulée dans une substance lipidique. L'invention concerne par ailleurs une composition pharmaceutique à libération contrôlée qui présente ce profil de libération modifiée et qui renferme une substance active, une substance lipidique intégrée dans la substance active, et un délitant organique apte au gonflage, dans des proportions comprises entre 3 et 20 % en poids.

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