I suffered from auditory hallucinations the first time I took them. I lasted for about 5 days, and then had to revert back to co-codemol.
At Christmas/New Year, I put my back out again and Dr prescribed Tramadol. I took them, they worked without problem (well, I got far more squiffy on New years Eve than I intended) but stopped taking them once the pain had eased.
Back to the co-codemol............
About 5 weeks ago, my back-trouble flared up, again. Went back on the Tramadol, but this time everything seemed to slow down..........including my breathing as I tried to sleep (which kept jolting me back awake !).
Coming off Tramadol gave me a twitching sensation and the occasional 'swooping' (like missing a step gives) feeling.............it doesn't last long so be prepared for that.
I felt twitchy and a little flu-ey coming off them