"have been taking nucynta for a few days. i was on oxycontin with oxycodone for break-through, but since the oxycontin was changed in february to tamper-proof, it doesn&#039;t work very well anymore. when i take nucynta, it makes me feel like a zombie, it only works for 3 hours for pain, when it is supposed to be 12 hours. i feel like i can&#039;t breathe, and get anxiety. it doesn&#039;t help me when waking in the morning from taking the night before like oxy does. it seems everyone says to let it build up but it is hard since i can&#039;t get up in the morning to go to work. i will give it more time to see if it gets any better."