I have never heard of Trilafon before, but when I looked it up, the Wikipedia page says:

"Several studies show that the use of perphenazine with fluoxetine (Prozac) in patients with psychotic depression is most promising, although fluoxetine interferes with the metabolism of perphenazine, causing higher plasma levels of perphenazine and a longer half-life. In this combination the strong antiemetic action of perphenazine attenuates fluoxetine-induced nausea and vomiting (emesis), as well as the initial agitation caused by fluoxetine. Both actions can be helpful for many patients."
Perphenazine - Wikipedia

Are you on Prozac? Or do you not tolerate antidepressants well? I'm just wondering that if you get depressed again while on Trilafon, maybe you can consider adding Prozac before dumping the Trilafon.

I found that very interesting!