I find this topic very interesting and have done some 'research' myself. Wondering if you have had any experience with Ritalin (Methylphenidate) or D-amphetamine? (both commonly used stimulant medications for ADHD) The paper listed below is an interesting read and calls upon further study for stimulants as a treatment for stuttering. Interestingly, there seems to be a heavy correlation between people who stutter and those with ADHD (or at least have similar symptoms). http://www.europeanreview.org/wp/wp-content/uploads/66-69.pdf