Comment by hollerith
The other things that are good for PTSD though don't carry a risk of making it worse: friendship with people who understand you and don't trigger you, talking about the traumatic experience, supporting general metabolic health and brain health.
For lessening the effect of traumatizing experience, 40mg of propranolol an hour before remembering and visualizing the traumatic, under guidance of a therapist, should be the gold standard for treatment. There a lot's of researchs showing its effectiveness but for some reason it's use stays experimental. I suppose it's because there is no money to be made with an old drug cheaply available from many generic suppliers.