Polymorphic forms α, β and γ of rifaximin

  • US 7,902,206 B2
  • Filed: 05/13/2008
  • Issued: 03/08/2011
  • Est. Priority Date: 11/07/2003
  • Status: Active Grant
First Claim
Patent Images

1. Rifaximin in polymorphic form α

  • free from other polymorphic forms of rifaximin not derived from Form α

    by water absorption or release, 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

    .

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