pain
"I'd like say there are many misinformed people here. Tramadol DOES help all kinds of pain. Tramadol is an opioid, it attaches to the same receptors Oxycodone does, and it's a PRODRUG -- meaning it must metabolize via CYP2D6 liver enzyme to work. 
Once it's converted over, it turns into M1 aka o-deso (for short) which is 6-10 times more potent than Tramadol, where it's real pain relief comes from. So People giving it 1 star? 
They are lacking proper metabolism OR they are taking a P2D6 inhibitor (some antiacids, like tagament), grapefruit juice, among others. 
A 50mg Tramadol tablet in studies has SUPERIOR pain relief to 40mg codeine+300mg Tyneol, and also showed the same pain relief as 5 to 7.5mg of Oxycodone. It works for pain..."