pain
"Prescribed 100mg every six to eight hours for lower back muscular pain.  Relieves symptoms and along with PT has provided relief.  I only take it when the pain flares up.  There was an initial instance or two of psychedelic like effects the first two or three times I took Nucynta and went to bed.  Seem to sleep okay after taking Nucynta now.  Provides much better relief than Oxycodone did.  Have experienced some tiredness while taking."