muscle spasm
"I took this when I pulled a muscle in my back and could no longer pick up my infant daughter. I took it in the middle of the day and it helped with the pain. Initially didn't make me sleepy but the next morning it was near impossible to wake up. It was that terrible "hang-over" feeling. It was the worst I've ever felt. I could hardly make myself wake up to get dressed and use the restroom. I laid around until almost 4pm the next day just because of pure lack of energy. Luckily I was only prescribed it for a week or so otherwise I'm sure I would have quit taking it because of the drowsiness after effect."