The digestive system and opioids

No.12873612 ViewReplyOriginalReport
So I had surgery not long ago and was on some serious opioids for pain and it messed up my stomach because they made me constipated for a week. So I took and enema because I couldn't take it anymore and I was physically and emotionally getting upset with everyone and everything. After I shat myself I found an undigested tablet in my poop. My question is "WHY" This is so fucked up! How can they prescribe medication like this? How does it work biologically