Self-precipitating pharmaceutical formulations for the...

A - Human Necessities – 61 – K

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Details

A61K 9/10 (2006.01) A61K 9/00 (2006.01) A61K 9/16 (2006.01) A61K 38/00 (2006.01) A61K 47/48 (2006.01) A61K 48/00 (2006.01)

Patent

CA 2685873

The present invention relates to novel pharmaceutical formulations for the prolonged release of active principle (AP), which make it possible to release the AP over a prolonged duration of several days, or even several weeks. The invention relates, in a first aspect, to a liquid formulation, comprising at least one active principle (AP) and an aqueous suspension, based on colloidal particles of a polymer (PO), characterized in that it satisfies the following four conditions: (a) the polymer (PO) is a polyamino acid comprising glutamic residues, - certain glutamic residues bearing a pendant cationic group (CG), the cationic groups being identical to or different from one another, - other glutamic residues bearing a pendant hydrophobic group (HG), said hydrophobic groups (HG) being identical to or different from one another; (b) the value pHf of the pH of said formulation is between 3.0 and 6.5; (c) for the value pHf of the pH, the polymer (PO) forms a colloidal solution which combines spontaneously and non-covalently with the active principle (AP); (d) 1 ml of said formulation precipitates during mixing with a volume of 1 ml of a test buffer solution Tp. The invention also relates to the process for preparing this formulation and a process for preparing medications.

La présente invention concerne de nouvelles formulations pharmaceutiques pour la libération prolongée de principe actif (PA), permettant de libérer le PA sur une durée prolongée de plusieurs jours, voire plusieurs semaines. L'invention concerne dans un premier aspect une formulation liquide, comprenant au moins un principe actif (PA) et une suspension aqueuse, à base de particules colloïdales d'un polymère (PO), caractérisée en ce qu'elle satisfait aux quatre conditions suivantes: (a) le polymère (PO) est un polyaminoacide comprenant des résidus glutamiques, - certains résidus glutamiques étant porteurs d'un groupement cationique (GC) pendant, les groupements cationiques étant identiques ou différents entre eux, - d'autres résidus glutamiques étant porteurs d'un groupement hydrophobe (GH) pendant, lesdits groupements hydrophobes (GH) étant identiques ou différents entre eux; (b) la valeur pHf du pH de ladite formulation est comprise entre 3,0 et 6,5; (c) pour la valeur pHf du pH, le polymère (PO) forme une solution colloïdale qui associe spontanément et de façon non covalente le principe actif (PA); (d) 1 ml de ladite formulation précipite lors d'un mélange avec un volume de 1 ml d'une solution tampon test Tp. L'invention concerne également le procédé de préparation de cette formulation et un procédé de préparation de médicaments.

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