Um, there is NO medication for trauma. All the stuff merely acts like pain-killers in that situation. You cannot medicate away trauma.

I actually heard nighmares, as horrid as they can be help you to process the bad ****. They keep one's brain from going all out crazy. So if this is true, I have no idea what good is it to supress them (maybe it's western medicine thing, treating body's coping mechanisms as something that needs to be done away with it. Just like fevers).