I have used this medication, it didn't do much for me. It might be worth trying, but I'd be super paranoid about taking anything related to a full opioid antagonist while taking full agonist opioids. When I took it I hadn't used in a couple days.
Stimulant laxatives are definitely not safe to take long term at high doses, but stool softener are prettt safe. Perhaps try those, increase your fiber, exercise and drink plenty of water. That probably helped me deal with opioid related constipation. Sometimes I'd put off dosing until right after pooping, as that was necessary on a few occasions.
I just realized though, you are asking about the oral use of this medication? I thought it was only meant for IM/SC use? I believe I had it IM.
And fyi this medication is VERY expensive.