Maria,
All you can do is try it to see if it works. If it doesn't, nothing lost. If it does, well that's self explanatory

.
I was on Dilaudid for 6 months - after my ADR surgery. It was the only think completely reliable, along with a daily box of prunes
This is a pain in the ars, pun intended but something most of us suffered through. I tried everything recommended to wake up my intestines. Then my meds added another element.
Try it, that's all you can do. BTW, Metamucil adds bulk, a difficult side effect for some.
Dale