Before you experiment with drugs, have you tried http://www.stutteringhelp.org/portals/english/book_0012_tenth_ed.pdf ? About medication. There are some drugs, wich reduce stuttering, but have side effects. Ecopipam is the next hope in the reasearch. They discussed it on Stuttertalk: http://stuttertalk.com/ecopipam-as-pharmacologic-treatment-of-stuttering-ep-645/ Sadly it isn't on the market yet. Olanzapine and Risperidone where testet in small trials. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3971108/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3678230/