I had anxiety attacks at night sleeping, that's how bad my anxiety got. Klonopin helped that. But answering your question. The desvenlafaxine was much like the effexor. The only side effect I got was a little dizziness when I dropped 50 milligrams. Each time. I've started week 3 of a total of 3 weeks. No dizziness yet. At the end of this week I stop it completely and start a rather benign ssri Prozac. I assume with the total stop of the desvenlafaxine I will get something. We'll see. 6 days left.