I'm not gonna bother. Look up "Pharmacological treatment of stuttering" and there is an article that sums up most of my points. Regarding FDA funding - it costs $100s of millions to get FDA approval for a given condition and these drugs are all off-patent. No pharma company is gonna pay for funding if there is no $$$ to be made Stuttering is "learned"? No its not. Its a neurophysiological deficit, hence why it has existed cross-culturally and since humans could communicate verbally.