Desvenlafaxine
"I started taking Pristiq 50mg for Major Depression, major anxiety, Chronic pain. I took it first day and it was GREAT! First week sleep, headaches were rough but energy was good. Gradually started decreasing by itself as I kept taking the pills. 9 month's later I was still taking the pills but I was dizzy, getting brain zaps, CRS, tinnitus, major anxiety, non-stop migraine for 2 months, bed rest, and had to go to psych hospital. Psych. MD upped to 100mg  Pristiq that lasted a week. My whole spine was HURTING and now I am switching over to a new SNRI that I am not happy about. And still on withdrawal from Pristiq. "