Provided are a production method of a pregabalin-containing composition, which suppresses crystallization of pregabalin, and a pregabalin-containing composition that shows suppressed crystallization of Pregabalin. The production method of the pregabalin-containing composition of the present invention contains steps of:(1) dissolving pregabalin in an aqueous solution of an acid to prepare an aqueous solution of a salt of pregabalin； (2) mixing the aqueous solution of pregabalin salt and a hydrophilic resin to prepare a mixture thereof； and (3) concentrating the mixture； wherein the acid has an acid dissociation constant lower than that of pregabalin.
