Patent ID: 8853231

Claim:
A pharmaceutical composition comprising a polymorphic form of rifaximin together with a pharmaceutically acceptable carrier, wherein the polymorphic form is form α, having x-ray powder diffraction pattern peaks at about: 7.4°, 7.9°, and 11.8°; or 7.4°, 8.8°, and 11.8°; or 7.4°, 10.5°, and 11.8°; or 7.4°, 11.1°, and 11.8°; or 7.4°, 11.8° and 12.9°; or 7.4°, 11.8° and 17.6°; or 7.4°, 11.8° and 19.7°; or 7.4°, 11.8° and 21.4°; or 7.4°, 11.8° and 22.1°, or 7.4°,11.1°, and 12.9°; or 7.4°, 11.1°, and 19.7°; or 7.4°, 12.9°, and 19.7°; or 11.1°, 11.8°, and 19.7°; or 11.1°, 19.7°, and 21.4°; or 11.1°, 19.7°, and 22.1°, or 11.8°, 12.9°, and 19.7°; or 11.8°, 19.9°, and 22.1°, 2θ.