Been off drugs for 6 months, but not been coping so been back on Sertraline for a month, think its called Zoloft in US, i was on this for a couple of years before i stopped, as it got to the point that i didn't think it was helping much, GP said this is the only drug for PTSD?, i'm on 200mg which he says i carn't increase, does this drug lose its effect?, or does anyone know of anything else they could recommend?