New polymorphous forms of rifaximin, processes for their...

Details New polymorphous forms of rifaximin, processes for their... New polymorphous forms of rifaximin, processes for their...

C - Chemistry, Metallurgy

07

D

C07D 498/22 (2006.01) A61K 31/395 (2006.01) A61P 31/04 (2006.01)

Patent

CA 2594789

Crystalline polymorphous forms of the rifaximin (INN) antibiotic named rifaximin .delta. and rifaximin .epsilon. useful in the production of medicinal preparations containing rifaximin for oral and topical use and obtained by means of a crystallization process carried out by hot-dissolving the raw rifaximin in ethyl alcohol and by causing the crystallization of the product by addition of water at a determinate temperature and for a determinate period of time, followed by a drying carried out under controlled conditions until reaching a settled water content in the end product, are the object of the invention.

L'invention concerne des formes cristallines polymorphes de l'antibiotique rifaximine (INN), appelées rifaximine d et rifaximine e, pouvant être utilisées pour fabriquer des préparations médicinales contenant de la rifaximine pour un usage oral et topique, et obtenues au moyen d'un procédé de cristallisation effectué en dissolvant à chaud la rifaximine à l'état brut dans de l'alcool éthylique et en provoquant la cristallisation du produit par ajout d'eau à une température déterminée et pendant un laps de temps déterminé, suivi par un séchage effectué dans des conditions contrôlées jusqu'à atteindre la teneur en eau voulue dans le produit final.

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