Thanks, Obvious_Elephant. The drug treatment under clinical trials at NIH.us.gov might not be the definitive answer for all stuttering, but the research will be proof of concept and open the door to further research into this baffling disorder. See: https://pubmed.ncbi.nlm.nih.gov/32292321/#:~:text=Abstract,the%20severity%20of%20stuttering%20symptoms.