Interesting comment. Because of this ("stutterers have much more dopamine in their brains") I thought let’s try some antipsychotics, which are dopamine antagonists. So, I decided to take 10 mg of olanzapine. I cannot say whether the stuttering decreased, maybe a little, but the side effects were unbearable, at least for me. I felt like shit after that. Basically, you don't want to do anything and you have to force yourself to do any activity. So, I will never try it again. But maybe some people could have benefit from it. It may work for you.