Polymorphous forms of rifaximin, processes for their production and use thereof in the medicinal preparations
DC CAFCFirst Claim
1. A pharmaceutical composition comprising a therapeutically effective amount of rifaximin together with excipients, wherein the rifaximin has a X-ray powder diffraction pattern peaks at about 5.7°
- ±
0.2, 6.7°
±
0.2 and 8.0°
±
0.2.
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Abstract
Crystalline polymorphous forms of the rifaximin (INN) antibiotic named rifaximin δ and rifaximin ε 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.
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Citations
18 Claims
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1. A pharmaceutical composition comprising a therapeutically effective amount of rifaximin together with excipients, wherein the rifaximin has a X-ray powder diffraction pattern peaks at about 5.7°
- ±
0.2, 6.7°
±
0.2 and 8.0°
±
0.2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 15, 16)
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12. A pharmaceutical composition comprising a therapeutically effective amount of rifaximin together with excipients wherein the rifaximin has X-ray powder diffraction pattern peaks at about 7.3°
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0.2, 8.2°
±
0.2 and 10.3°
±
0.2, 2θ
. - View Dependent Claims (13, 14, 17, 18)
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Specification