About 10 days ago I started 2 mg twice a day of Prazosin for PTSD and nightmares. I don't remember my nightmares, but I wake up with heart beating sometimes up to 140 beats per minute. I have sever daytime anxiety (physical). I was very hopeful 1st night on Prazosin I remembered my nightmares. Since then I don't and it doesn't seem to be helping. I'm suppose to go to 6 mg after second week and increase until 10 mg a day. Has Prazosin ever made someone's PTSD symptoms worse? My doctor said I'm very sensitive to medicines.