To remarkably improve the bitterness of a drug perceived in the oral cavity when taking an orally disintegrating tablet containing a fast-dissolving drug.SOLUTION: An orally disintegrating tablet is provided, which has a drug dissolution rate ranging from 40.0 to 70.0% at 5 minutes after the start of a dissolution test performed using a second solution of dissolution test (1 volume of pH 6.8 phosphate buffer added with 1 volume of water) according to the dissolution test of the Japanese Pharmacopoeia, 17th Edition, (paddle method). Preferably, the drug is memantine hydrochloride or solifenacin succinate.SELECTED DRAWING: None【課題】溶出速度が速い薬物を含有する口腔内崩壊錠を服用した時に口腔内で感じる薬物の苦味を顕著に改善すること。【解決手段】第１７改正日本薬局方溶出試験法（パドル法）に従い、溶出試験第２液（ｐＨ６．８のリン酸塩緩衝液1容量に水1容量を加えたもの）を用いて行った溶出試験の開始５分後の時点における薬物の溶出率が４０．０～７０．０％の範囲内にある、口腔内崩壊錠を提供する。薬物はメマンチン塩酸塩やソリフェナシンコハク酸塩であることが望ましい。【選択図】なし
