I am a pain specialist patient and have been for about 5 years. I take 150mg of Nucynta ER twice a day. Two months ago I was taken off 50mg of Nucynta/day for breakthrough pain. For the last several months, I have been required to have a UA. Today, I was told that the UA from last month showed no traces of Nucynta. How can this be possible? I do occasionally fall asleep before taking my night medicines, but I can't remember if that was the case last month.