Olanzapine is another Dopamine antagonist, which means it essentially blocks dopamine in certain brain regions, and it also reduces seratonins inhibition of dopamine too. Whether it works for you or not depends on what your current baseline dopamine levels are like. If it’s hyperactive like most stutterers it should improve fluency. However, if your baseline is already low, be ready for some extreme changes to your mood and motivation etc… If a dopamine antagonist (like Risperidone or Olanzapine) improves your speech fluency, that suggests dopamine overactivity in speech motor circuits. Basically it’ll be trial and error test to see where yours is at.