This invention provides a stabilized oral solution containing vitamin B1 derivatives or a salt thereof (Fursultiamine for example, or a salt thereof) and vitamin B2 series.Stability of the oral solution containing vitamin B1 derivatives or a salt thereof (Fursultiamine for example, or a salt thereof) and vitamin B2 series can be improved by being blended with a gallic acid, or a salt thereof, or an ester thereof.本發明係提供一種含有維生素B1衍生物或其鹽(例如呋喃硫胺(Fursultiamine)或其鹽)及維生素B2類的安定化之內服用液劑。於含有維生素B1衍生物或其鹽(例如呋喃硫胺或其鹽)及維生素B2類之內服用液劑中,可經由另調配沒食子酸或其鹽或其酯而提昇安定性。本案圖式僅為實施例與比較例中的主要成分之殘存率之比較,不足以代表本案之所有特徵,故本案無指定代表圖。
