Tramadol and Rimadyl are frequently used together to treat painful conditions. Tramadol is a centrally acting (works in the brain) analgesic used for treating moderate to severe pain and is in the same family as codeine. Rimadyl is a non-steroidal anti-inflammatory (NSAID) that acts to block the inflammatory cycle and thus decrease the pain caused by inflammation.
It is safe to combine the two of them for more effective pain control. I hope this helps. Please let me know if you have any further questions.