That’s also a dopamine D2 receptor antagonist, meaning it blocks dopamine activity strongly, even more so than Risperidone does, which is more moderate on D2 receptors. This further reinforces the fact that stuttering is a neurological condition which at its roots, is a dysregulation in the dopaminergic system. By calming down the hyperactivity in dopamine, we can speak more fluently. GABAergic drugs have a similar effect as they “push the brakes” on dopamine activity, calming down the nervous system.