Nope, it's not a thing that's been recorded. Someone might be able to see a positive effect if, say, their depression was likely to increase their amount of stutter, and maybe the medication would help with that, apart from the depression itself (which is the thing it's meant for, after all). But then again, someone might get some side effects which were likely to increase the amount of stutter, so there's really no guarantee. Research is ongoing, so maybe something will turn out, certainly.