A liquid drug composition to be encapsulated in a soft capsule of which the capsule shell is mainly composed of succinylated gelatin, said liquid drug composition comprising (a) at least one phenol derivative of a mixture of multiple phenol derivatives and (b) a substance that has been made insoluble in succinylated gelatin； and a soft capsule, of which the capsule shell is mainly composed of succinylated gelatin, and in which a liquid drug composition comprising (a) at least one phenol derivative or a mixture of multiple phenol derivatives and (b) a substance that has been made insoluble in succinylated gelatin is encapsulated.
