I was prescribed Tramadol for the agony I was in with my wisdom tooth because it was a six month waiting list to have it removed. At the time I was overweight at 5'4" and at least 18 stone so it did absolutely nothing for me. Well I think that was why anyway because I was taking twice the dose and still nothing. I was told not to worry about taking that much because I was overweight so they wouldn't have the same effect as they would someone who wasn't overweight. I had no side effects from it whatsoever. That's about all my knowledge on it I'm afraid.