As with many medicines, vastly different experiences on here! I've have had both hips replaced, in each case (& both ops went very well, swift recoveries) I was given Paracetamol and Tramadol, handed out like Smarties.
Luckily I needed very few painkillers when home, although I had some twinges here and there, nothing very severe, and I didn't take what wasn't needed.
However, IsNibs has a back injury, sometimes takes painkillers when it's really bad, and reports all the well-known constipation issues with drugs of that group!
Plus -- we know someone who occasionally delivers prescriptions, covering for other drivers. I recall him saying that he has to deliver masses of Tramadols (& other PKs), and hears all sorts of accounts of various side-effects, as some have said on here, different bodies react differently!
He also said they regularly hear from people who just don't take what is prescribed (so, don't get them from the chemist then?!) and sadly, after a death, they may get relatives bringing in carrier bags full of meds that were prescribed, but not used --- no wonder the NHS costs so much?!