Opioids can also cause extreme constipation, which can also result in extreme agony when you're coming off of them. That's what happened to me when I was coming off morphine and oxycodone given me in the ER to treat kidney stone pain. It was hell, and that experience alone makes me seriously contemplate refusing all pain killing medication if I'm ever offered it again.

I'm not suggesting you use opioids again but, if you need to, I recommend Lactulose for the constipado. It's a sugar that can't be digested and pushes things along nicely. That's a little better than going though agonising pain or needing to overdose on a laxative with an LD50.

It becomes a weird opioids to laxatives dance. Not fun I guess.

Yeah, they also give you tamsulosin, though, which relaxes expands the ureter, maybe that's part of the reason