When in the water suspensoid medicine of the slightly soluble medicine, poly- vinyl pyrolidone and the water soluble anionic characteristic macromolecule is combined, the medicine particle can cohere, can prevent the enormous crystallization of the suspended particle, and the secondary particle formation etc of the sinkage particle can manufacture the water suspensoid medicine which it does not come in contact or does not adsorb to the container and the like which in addition consists of plastic material such as polypropylene and polyethylene and. The book water suspensoid medicine because re-detachability is satisfactory, is useful as an instillation medicine, a point nose medicine, a point ear medicine, an injection medicine, an internal use medicine, a liniment medicine and a lotion medicine.難溶性薬物の水性懸濁液剤に、ポリビニルピロリドンおよび水可溶アニオン性高分子を配合すると、薬物粒子が凝集したり、懸濁粒子の巨大結晶化や沈降粒子の二次粒子形成などを防止し、またポリプロピレンやポリエチレンなどのプラスチック材質からなる容器などへ付着および吸着しない水性懸濁液剤を調製できる。本水性懸濁液剤は再分散性が良好であるため、点眼剤、点鼻剤、点耳剤、注射剤、内服剤、リニメント剤、ローション剤として有用である。
