A pharmaceutical composition according to the present invention comprises: (I) at least one member selected from the group consisting of oxazole compounds, optically active isomers thereof, and salts thereof, the oxazole compounds being represented by general formula (1): wherein R represents a hydrogen atom or Calkyl group； n represents an integer from 0 to 6； and R represents, for example, a group of general formula (A) shown below: wherein R represents a phenoxy group, optionally substituted on the phenyl ring with one or more members selected from the group consisting of halogen atoms, halo-substituted or unsubstituted Calkyl groups, and halo-substituted or unsubstituted Calkoxy groups； and (II) at least one cellulose compound selected from the group consisting of hydroxypropyl methylcellulose phthalate and hydroxypropyl methylcellulose acetate succinate. The present pharmaceutical composition has an improved oxazole compound water solubility.
