Thats interesting, I am prescribed adderol for ADD but go off it every now and then (depending on the kind of activity I’m doing like work vs. vacation). I notice that when I am on it there are moments where fluency gets worse, but it is almost immediately counteracted because I’m able to focus on fluency techniques better. I’ve also tried things like CBD (not for my stutter, just for fun) and found that, yes, they do help up front, but the “laziness” side effect of the medication tends to make me loose my track of thought and causes any minor stutter that does come up to really screw with me. Frankly, the only fool proof method I know of, is to be completely sober, slightly empty stomach, and PLENTY of sleep. I really can’t stress how good sleep can be.