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I'm pretty sure it's under active, not over active. People with PTSD are constantly in a state of agitation and fight or flight mode. People with depersonalization are basically always in flight mode, leading to underutilization of most somatic parts of the brain. If you research kappa opioid receptors, it links pretty directly with our state of mind. That's also why the only reliable drug that has been shown to help is naloxone, which is also an opioid antagonist. It's just not a selective antagonist so it doesn't directly serve the purpose.Isn't dissociation also common in people with "overactive amygdalae" like in EUPD and PTSD? I'm not sure how their depersonalization differs in presentation or what this would have to do with a hypothetical drug. This overactive amygdalae claim is something I heard from clinicians and not something I've studied myself. Regardless, trailing any medication is probably better than trailing none. Psychiatrists have told me the goal of drug interventions now is to "normalize" certain systems. In emotionally unstable people they have hot, overly emotional moments as well as cold, empty moments and everything in between, so stability is a good goal for them.