I have been taking tramadol 50mgs for 4 years now and it works very well for me. Last month and this month I noticed that it was not working well, I break out in sweats, stomach feels very empty and am aching all day, as if they have changed the mgs or something. No, its not me. The pills I had just before the last bottle worked fine and always have. Something is wrong. I'm almost afraid to take them now.