Patent ID: 7915275

Claim:
A method of treating bacterial infection in a patient suffering from a bowel related disorder comprising administering to a patient in need thereof a solid pharmaceutical composition comprising a therapeutically effective amount of one or more of Form α, Form β, or Form γ polymorph of rifaximin and a pharmaceutically acceptable excipient or carrier, wherein the amount of each of Form α, Form β, or Form γ polymorph of rifaximin present in said pharmaceutical composition is an amount to control the amount of systemic absorption of said rifaximin, wherein the rifaximin Form α has x-ray powder diffraction pattern peaks at about 7.4°; 19.7°; 21.0° and 22.1° 2-θ, wherein the rifaximin Form β has x-ray powder diffraction pattern peaks at about 5.4°; 9.0°; and 20.9° 2-θ, and wherein the rifaximin Form γ has x-ray powder diffraction pattern peaks at about 5.0°, 7.1°, and 8.4° 2-θ.