I second this..if your stutter results from anxiety this would help alot..my brother was 100% fluent with nobody around and 10% fluent when consciously speaking to another person(even the dog)..keyword is CONSCIOUS.. Later on he was diagnosed with severe anxiety tho he never seemed anxious..they put him on a bunch of stuff like OP mentioned but for a brief while because of the potential liver side effects..we noticed great improvement with fluency..But had to discontinue bcos of the potential side effects then he did full spectrum cbd and thats been doing the trick ..he also mentioned when alcohol geta him numb he kinda achieves 99% fluency,but alcohol came with its own problem and he had to discontinue the habit..cbd is his own cocaine atp..