Will being on ambien (zolpidem) help with ptsd flashback nightmares?

No: Generally speaking, no. It may help you sleep, but it may make your nightmares worse. Psychotherapy and different medications like Clonidine or prazosin can help with nightmares. Get help from a mental health expert if the nightmares are so bad that you can't sleep.

Maybe: People don't usually recall their nightmares unless they awaken from them. If ambien, (zolpidem) or some other sleep med, can induce a deep enough sleep where one doesn't awaken from nightmares, then--indirectly--the nightmares have been "cured." every patient is different. Only way to know is to try and see. Other options are prazosin and Clonidine which temper the autonomic response to nightmares.

Usually not: Ambien (zolpidem) is usually unhelpful for ptsd nightmares. Prazosin might help. Talk to your doctor about it.