Stuttering, and potential drugs.

Stuttering, and potential drugs. So short story, I used to trial Vyvanse for ADHD and for that year or so I found that I could talk much faster and seemed to block less. Vyvanse is apparently supposed to increase dopamine levels in the brain so maybe it has something to do with that. It definitely wasn't placebo as I was literally talking more than I ever did and with far less friction in my speech. I unfortunately had to get off Vyvanse as it wasn't really helping with the focus long term (I don't have ADHD) and gave me mood swings. It seems like on this sub people have tried a variety of drugs to reduce their stuttering but has anyone had long term success with anything?