Tapentadol
"Was skeptical when doctors swapped me from endone to slow release (SR) tapentadol. Huge headache and nausea 1st week. Over next month felt like the twice daily 50 mg would wear off in 5 hours.  So specialist has doubled dose to 4 x per day. I feel a bit weird for the first hour after taking it but thats better than the up and down effect of endone. I feel like the pain is better controlled now taking dose 4 times per day. But general doctor was reluctant to increase, so very glad I saw the specialist and his recognized that pain that SIJD causes."