My GI doctor prescribed Miralax a few weeks ago. I tend to go overboard on things and decided to take the double dose of Miralax. While I am miserable with IBS-C, I SO prefer to have this than IBS-D. It was a horrible experience. Needless to say, I stopped the Miralax and it took 5 days to get stable again. I am going to try the Miralax at the correct dose and am hoping this will help with C. I am no longer on Zelnorm. I currently take a Chinese herb that has done wonders for me. The C is so strange because it is hard to guage whether I eat enough to produce a BM everyday. I eat primarily SF foods because the IF foods are really bothersome and boy, can I clear a room Hope this helps.