A composition comprising solifenacin succinate with the content of impuritie s reduced, which can be used as a pharmaceutical primary material. This composition comprising solifenacin succinate is especially featured by reduction of the content of optical isomers thereof as compared with the conventional compositions containing solifenacin acid adduct salts and can b e used in the production of pharmaceutical products containing solifenacin succinate. There is further provided a process for easily producing this composition comprising solifenacin succinate.
