My experience with Miralax was a nightmare. I had a severe allergic reaction which involved hives, splitting headaches, abdominal pain, rectal burning, serious back pain and excema, which covered my head, neck and face. As soon as I stopped taking it, most of the symptoms went away. However, the back pain decreased by 80% almost overnight, but never went away completely. I've been off of it for just over a year. My doctor thinks that it triggered some sort of autoimmune response. According to what I've read, Schering-Plough HealthCare Products, Inc., the company that makes Miralax, has gone out of its way to prevent the information about adverse reactions from getting out. If they can delay having their product removed from the market, they can make billions, and that's all they care about. According to the National Institutes of Health, Miralax causes nausea, stomach pain, bloating, vomiting, rectal irritation, rash, hives and skin irritation, but if you look at a bottle of Miralax, it says "Miralax does not cause cramps, bloating or gas", which is a lie. The Department of Health and Human Services issued a letter to Braintree Laboratories, which disseminates promotional material for Miralax, asking that they change the packaging to accurately reflect not only the efficacy of the product, which has consistently been exagerrated, but all of the adverse reactions, but as far as i know, they haven't complied. I've seriously considered suing them, and probably will.