An orally administered liquid formulation, characterized by being obtained by blending a) vitamin B2 or an orally administrable sale thereof, b) an herbal-medicine-derived component, c) 1-10 parts by mass of polyvinyl pyrrolidone with respect to 1 part by mass (raw herbal medicine amount) of the herbal-medicine-derived component, and d) 0.02-1.6 parts by mass of at least one species selected from gallic acid and a derivative thereof with respect to 1 part by mass of vitamin B2. This orally administered liquid formulation has the excellent stability of a vitamin B2 species and does not precipitate in a liquid formulation, and can be applied in the fields of medicine and food products.本發明係一種內服液劑，其特徵為調配a)維生素B2或其可內服的鹽、b)來自生藥成分、c)相對於1質量份(原生藥量)之來自生藥成分為1~10質量份之聚乙烯吡咯烷酮及d)相對於1質量份之維生素B2為0.02~1.6質量份之選自沒食子酸及其衍生物中之至少1種，此內服液劑具有優異之維生素B2類安定性，且為在液劑中不發生沈澱之內服液劑，更可應用於醫藥、食品領域中。
