PROBLEM TO BE SOLVED: To provide a solid pharmaceutical preparation of solifenacin or a salt thereof, the preparation being stable and inhibited from decomposing with time when supplied to clinical fields.SOLUTION: The composition for a solid pharmaceutical preparation of solifenacin or a salt thereof contains solifenacin or its salt each in a crystalline from, and the content of amorphous body is within a range not to affect the safety of the product. A process for producing the composition and a medicinal composition for solid pharmaceutical preparations which contains solifenacin and an amorphization inhibitor are also provided.【課題】ソリフェナシンまたはその塩の固形製剤を臨床現場に提供するに当たり、経時的な分解を抑制できる安定なソリフェナシンまたはその塩の固形製剤の提供。【解決手段】ソリフェナシンまたはその塩の結晶体を含有し、その非晶質体含有量が製品の安定性に影響を与えない範囲内であるソリフェナシンまたはその塩の固形製剤用組成物及びその製造方法であり、ソリフェナシン及び非晶質化抑制剤を含有してなる固形製剤用医薬組成物。【選択図】なし
