Patent ID: 9737610
Date: 2017-08-22
CPC Classifications: A61K,A61P,C07D

Claim:
1. A solid dispersion form of rifaximin, comprising rifaximin and one or more polymers selected from hydroxypropyl methylcellulose phthalate (HPMC-P), hydroxypropyl methylcellulose acetate succinate (HPMC-AS), polyvinylpyrrolidone, and a polymethacrylate, wherein the ratio of rifaximin to polymer is 25:75, 50:50, or 75:25 by weight, and wherein the solid dispersion form of rifaximin is characterized by an XRPD spectrum of one or more of the XRPD spectra of FIGS. 7, 12, 17, 22, 31 and 36 .