I wouldn't like this med.

"People who are comatose or who are at reduced levels of consciousness or alertness should not take Trilafon."

http://www.drugs.com/pdr/perphenazine.html

I told my doctor I didn't take drugs that have a side effect of "death" and he laughed with me but agreed. This instruction strikes me as a warning that it is not a drug that would be "smart enough" to help me :-) How is a comatose individual going to take anything? There were way too many warnings on all the pages I read too. But I also read the tardive dyskinesia mostly occured in older women and it seems if you're not one of those and on a low dose it might be okay for awhile.

On the positive side, that it is fairly "old", tried and true would make me feel the doctor might know a bit more about it and have had more experience with more patients on it? That would help me some.

Maybe some of the PTSD symptoms are treatable as if they are "unreal"/hallucination-like? I'd certainly stay on it for at least your "usual" 2 months unless something really bad happened that scared me? Then you can re-evaluate if you are comfortable enough to continue.