After a great 7 year run on Zoloft with Lamictal, the Zoloft had pooped out. I'm going to start the Viibryd and step down on Zoloft over a week. The worst thing I can do when I'm down, is lose sleep. I was also interested in the effect on libido? Right now I have zilch. When I miss doses of my antidepressant it goes up but its not worth it as my anxiety goes thru the roof. Anyway any feedback is appreciated!