All I can say is that I have the same problem with Lexapro. Have tried Miralax and try to eat as much fiber as I can. It's just one of the side effects of these medications and I too wish I had an answer. I was told to drink a lot of water...do that too. I'm weaning off Lexapro even though it has helped me somewhat. Too many side effects...epecially the dry mouth. Guess our intestines dry up too!