Polyethylene glycol 3350
"I had been backed up for at least half a year when things went from bad to worse. The last two months, I was lucky to go once a week. My stool was so hard and big that it hurt to much to go. My doctor prescribed Miralax to me and it started to work a little. Then, she recommended I take two cap fulls in two cups of water instead of one in one. After a day or two, I went to go and it literally went from 100% bad to 100% great. I was not only able to go but it didn't hurt at all. It was so amazing to finally not be in pain that I literally cried. I would absolutely recommend this product to anyone with that kind of constipation."