I personally wouldn't take it.
I did however go watch and read some articles about propranolol and how it was being tested. I am under the distinct impression that one is disconnected from the emotions of the tramatic event; that it isn't forgotten. It maybe beneficial to some who suffer from PTSD. People have been taking this medicine for years for high blood pressure and they still know what has happened to them. I really don't think this is going to be a MIB where they flashy thing someone in pill form and totally forget who they are.
When Ella had her laceration from a fall stitched up they gave her ketamine. She remembers falling, being at the hospital, etc., but she doesn't remember the pain and she didn't complain about pain afterward. In fact she laughs and says that she bounced. IMO, the medical community should research this to its full potential. With all things good there are some who will use it for bad. With further studies and the advances in modern medicine it may be possible to erase memories, in my opinion, that would be wrong.