New study shows antipsychotic drugs can suppress the immune system. ~~ This article came up as a memory on Facebook. I never posted the following thoughts on the topic and am doing so now for the sake of those who wish to do more research. this is what I wrote (with some edits) and it remains true: yes, "antipsychotics" (neuroleptic pharmaceuticals) suppress the immune system. That is exactly what they do, and frankly, how they "work".