An object of the present invention is to provide a coated solid preparation applicable to a one-dose pack, wherein, even when the preparation is in an unpacked state, the stability against moisture of valproic acid or a pharmacologically acceptable salt thereof contained therein is maintained and the deliquescence is suppressed. The present invention provides a coated solid preparation which contains as an active ingredient valproic acid or a pharmacologically acceptable salt thereof and is coated with a coating layer containing polyvinyl alcohol and swelling clay, wherein the mass ratio of the polyvinyl alcohol to the swelling clay is 8:2 to 3:7 and the swelling clay is dispersed as a laminated structure.
本发明的目的是提供一种适用于一剂包装的包衣固体制剂,其中,即使制剂处于无包装状态,也能保持其中所含
丙戊酸或其药理学上可接受的盐的防潮稳定性,并抑制潮解。本发明提供了一种包衣固体制剂,它含有作为活性成分的
丙戊酸或其药理上可接受的盐,并包有含有聚
乙烯醇和膨胀粘土的包衣层,其中聚
乙烯醇与膨胀粘土的质量比为 8:2 至 3:7,膨胀粘土分散成层状结构。