depression
"Given to me for pain, didn't work for that but, it worked great for my restless leg syndrome and my depression.  I take 4 at once a day in the afternoon. I never take more than that. 
I am addicted, tried to stop taking them for 2 weeks and I felt sooo sick and weak. I also started getting these weird tings in my head, like a rubberband snap sensation.  
I can't stop taking them. If I do I cant function well."