they are dangerous
I raced motorcycles (motocross) and bicycles all of my life- and got hurt a lot- rotator cuffs, collar bones, broken legs, ankles, toes etc- . Having said that- take as prescribed- tolerance builds quickly, and they (at least me) made me feel great- too great especially at first. If the DR prescribes it- take it. But be careful.- when the tolerance builds you are inclined to increase- PLEASE DONT. Cubile had a good synopsis. My personal experience was with percocet and oxycontin (and H- which is stupid- not prescribed of course)- if you stop expect about a week at least of flu like symptoms. After that it goes away completely 100%. But- they do work very well and as long as you take the prescribed dose its cool. Drs actually do know what they are doing....and I am not a dr so not giving medical advice..just experience.
much love-
dub