The present invention encompasses methods of treating a subject who stutters. The methods can include the steps of: (a) identifying a subject in need of treatment; and (b) administering to the subject a therapeutically effective amount of a composition comprising a D1/D5 receptor antagonist, a D1/D5 receptor partial agonist, or a mixture thereof. For example, the D1/D5 receptor antagonist can be ecopipam or a pharmaceutically acceptable salt, solvate, hydrate, prodrug, structural analog, metabolite, or polymorph thereof.