I took an ultracet for pain aroind 3:45 yesterday. I was up all night and today I feel like I have been ran over by a truck. I am very fatigued, grouchy, emotional. If I didn't have a hysterectomy three years ago I would think I was having a bad case of PMS. I have cried over petty stuff all day today. I am clearly not myself. My Dr.also told me it was non addictive and not a narcotic. I believe Ultracet could indeed become addicting as it gives one a very nice feeling of uphoria much like that of a narcotic.