Ah, that's too bad. Do you know if there has been further research on other substances? I understand that stuttering still isn't researched very well, that scientists are only beginning to understand what might be the cause(s) and that neurological disorders are generally very complex to research. But who knows, maybe one day someone will come up with the "magic pill". Given that 1% of the world's adult population stutters, it would sure as hell be a lucrative market for pharmaceutical companies.