I've been taking pain killers for years due to my back problem (due to have an operation) but have since got addicted to them, pain in the blo*dy a#s to be honest.
Tramadol Slow Release 12hr - 400mg (normal dose is 100-200mg)
Co-Codomol (60mg codeine) - 4 times a day
Taking strong pain killers everyday to control pain makes your body want more, the doctors don't question it when you ask for more hence how I am addicted, I try to cut down and get all sorts of side effects (very bad ones).
And to be clear, some legal drugs can be a LOT worse than some illegal drugs.
Don't do it!