I stutter and also have anxiety/depression and for awhile I took Zoloft and especially when I was working on increasing my dose it made me stutter more too. I stopped taking it and my doctor recommended Prozac instead. I don’t think it is as bad as the Zoloft in regards to making me stutter more but I still noticed it a little. But it definitely works for me better than the Zoloft for my mental health (which is the reason I take it, not for my stuttering).