I think you have just mentioned all the medicatons there are that could potentially reduce stuttering. SSRIs, Benzos and antipsychotics. For me personally Lexapro (SSRI) did help reduce some stuttering. This is NOT an advice but if you are thinking about the side effects, you have take into account two things. What side effects will you have from medications, and would you want to deal with said side effects or deal with stuttering?