I was proscribed Tramadol for a bad back injury some time ago. Very effective but I was on a large dose for three months plus. I decided to stop using in favour of another drug on the advice of a GP and in doing so discovered that I had become dependant.
It is addictive and it took me three months or more to become completely free of the 'after effects' all of which were not very nice to say the least.
Needless to say I was un employed at the time because of the injury. Knowing what I do from this experience all I can say is that anyone who uses it and fly's - in any capacity - is foolish.