Quetiapine
"I am 65 and have PTSD from the loss of my son. I was prescribed Xanax and Klonipin for a few yrs but they did not deal with the panic attacks that I was experiencing. I cannot take SSRIs due to side effects, so I mentioned the Seroquel to my doctor who said it did have a mild anti depressant effect. I take .25 mg in the morning, and 3 of them at  night . No weight gain, I am very active. If anything, my appetite has fallen. I sleep 8 hrs REM sleep and don't really need as much of the xanax or klonipin now. The Seroquel has helped me function greatly and won't allow the panic to set in. So, I am happy with it."