http://lfpress.com/news/local-news/london-scientists-push-envelope-in-combating-opioid-addiction

Study showed that D1 blockers protect against PTSD, D4 blockers facilitated PTSD.
Amazingly some antipsychotics block D1 and might help protect vs. PTSD (and help at the underlying link between trauma and addiction)
Clozapine, Olanzapine are top two. No surprises. Seroquel very low. Surprise.

https://ils.unc.edu/bmh/neoref/this.dir.unneeded/schizophrenia/review/tmp/165.pdf