Disclosed is a composition for oral administration, which is capable of effectively preventing or ameliorating digestive tract functional disorders, particularly functional disorders of the upper digestive tract, more particularly functional gastrointestinal symptoms. The composition for oral administration is highly safe and is suitable for long term administration. The composition for oral administration contains sodium glutamate and arginine hydrochloride at a molar ratio of 1:1. The composition serves as an orally administrable agent for preventing or ameliorating digestive tract functional disorders. Also disclosed are foods and drinks containing the composition for oral administration.