In short yes. That is how I exited my total stutter for a manageable one that hardly ever crops up about 25 plus years ago. Used the drug to calm down about the effects of my stutter, then learned to pronounce things and work through speech blocks by understanding how sounds should be formed, practiced a lot then ditched the drugs and carried on pretty much as a normal speaker with an occasional block that I don't get phased by. More or less redid the bit of speech learning that kids in single digit age groups do when they have their proto-stutters that go on to just disappear while us stuttering folk aren't progressing and are adding social anxiety to our triggers. Might not work for everyone, did work for me, far better than the million quacks i tried before and frankly far better than the majority of speech therapists. To note though I had help from a therapist that rebuilds speech for stroke patients to understand what was mechanically going wrong with my speech during this period. Only speech therapy I ever had that wasn't a negative.