Ok. I am on day 4 of the 40mg of Viibryd. Yesterday I noticed a bit of anxiety and my heart pounding. Sleeping is a problem too. I have noticed a big difference in my mood... I was on Prozac for over 10 years and it quit working... so the doc changed me to this drug. I'm still on the fence about it. I know everyone has different results - I have read good and bad about this drug... I would like to know how long you have been on it and do the side effects get better...