I've had docs who prescribe meds "for PTSD", and it is fine. They might then go on to say it is specifically for nightmares or other aspects of PTSD, they might not. We all do the best we can.
Some folks have found relief of dissociative symptoms with medications.
Petunia's initial post in this thread is fine, and any of us who have support to offer as she starts this new med can do so. We can agree to disagree on terminology and the science of it all, what matters is mutual support here.
Sarah