Tapentadol
"Was put on nucynta 100 mg every six hours for a two week trial  after 60 mg of morphine long term use and tolerance. I have had major hot flashes, headaches, nausea   At first I thought maybe the conversation wasn't done correctly but this medicine just flat out does not work for me at all. I woke up with night sweats, had to go to the bathroom and couldn't go. I'd rather go back on the morphine and adjust the dosage up. They can have this drug."