Here’s another study, by the way: https://www.frontiersin.org/articles/10.3389/fnins.2021.598949 “In support of the basal ganglia involvement in stuttering, dopamine D2 receptor antagonists (such as haloperidol and risperidone) have been suggested to be effective in the treatment of stuttering (Maguire et al., 2020). Additionally in limited reports, medications that increase dopamine levels, such as L-dopa, have been associated with exacerbations in stuttering symptoms (Burd and Kerbeshian, 1991). Haloperidol, a first generation dopamine antagonist, has been studied in a limited manner for the treatment of stuttering with suggested positive results on efficacy. A previous study that utilized SPECT to investigate the effects of haloperidol on brain activity found that there was an increase in brain activity in speech areas, with subsequent improvement in symptoms upon haloperidol administration (Wood and Stump, 1980). Furthermore, improved fluency was associated with greater brain activity in speech areas (Wood and Stump, 1980). However, haloperidol is not a viable treatment for stuttering due to its poor tolerability and side effects (Rosenberger et al., 1976). Risperidone, which is a second generation dopamine antagonist with relatively lower risk of motor system side-effects compared to haloperidol, has been suggested in one limited, small sample size, preliminary trial, to improve fluency in adults who stutter (Maguire et al., 2002). It may also improve control over voluntary speech and involuntary tic-like movements by reducing the effect of dopaminergic projections on the left caudate nucleus, as suggested by a single-case study (Tavano et al., 2011).” I’m not just pulling these studies out of obscurely thin air. Doctors have prescribed these medications for stuttering fairly routinely. Just not as much anymore.