Movantik
"Been on opioids for a few years.  Taking Miralax for constipation.  Dr asked this month how my constipation was going. When I mentioned going twice a week she seemed to think that wasn't good so have me samples of movantik 25mg.  Took first time before dinner and it worked great!  Thought I would just take when feeling constipation.  A few days later took a morning dose.  I used the bathroom fine but afterwards Oh the Pain!  The worst stabbing lower intestine pain I've ever felt.  It came in waves for hours.  Bent over thinking of going to the ER.  I've been impacted before and had to go to the ER.  So embrassing but would choose that over mavantix every time!"