Aqueous sustained-release drug delivery system for highly...

A - Human Necessities – 61 – K

Patent

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Details

A61K 9/10 (2006.01) A61K 31/135 (2006.01) A61K 47/36 (2006.01) A61K 47/48 (2006.01)

Patent

CA 2611190

The present invention relates to liquid sustained release suspension dosage forms comprising ionized forms of water-soluble drugs. In particular, the invention encompasses a liquid form controlled release drug composition comprising a dispersed phase comprising an ion-exchange matrix drug complex comprising a pharmaceutically acceptable a ion-exchange matrix and a water- soluble electrolytic drug associated with the ion-exchange matrix, wherein the surface charge of the ion-exchange matrix is opposite that of the electrolytic drug wherein the dispersed phase further comprises a non-electrolytic, soluble component having low molecular weight and a diffusion controlling membrane and a dispersion medium substantially free of diffusible counterions, further comprising an excipient capable of associating with water and impeding water activity such that drug dissolution is inhibited prior to administration. The invention also provides methods for preparing such compositions and methods of treatment.

La présente invention concerne des formes posologiques liquides à suspension pour libération contrôlée comprenant des formes ionisées de médicaments hydrosolubles. L'invention concerne plus particulièrement une composition médicamenteuse liquides à libération contrôlée comprenant une phase dispersée comprenant un complexe médicamenteux à matrice d'échanges d'ions constituée d'une matrice d'échanges d'ions pharmaceutiquement admise et d'un médicament électrolytique hydrosoluble associé. En l'occurrence, la charge superficielle de la matrice est opposée à celle du médicament électrolytique. La phase dispersée comprend également un composant soluble non électrolytique de faible masse moléculaire, et une membrane de contrôle de diffusion et un milieu de dispersion sensiblement exempt de contre-ions capables de se diffuser. Le système comprend également un excipient capable de s'associer à l'eau et d'empêcher l'activité de l'eau de façon à empêcher toute dissolution du médicament avant l'administration. L'invention concerne également des procédés d'élaboration de telles composition, et des procédés destinés au traitements.

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