I was on 40mg Citalopram then down to 20mg. After 1 year I was changed to Escitalopram as I was going back to work but was put on 10mg. I take the 10mg when I am very nervy (not very often now) as I found they made me very sleepy in the mornings as I take my tablets when going to bed at night. I mostly take 5mg which seems to stabilise me at moment. I did not have any side effects when i changed to Escitalopram accept sleepiness in the mornings. Hope this helps