muscle spasm
"Was given this medication for degenerative disc disease and muscle spasms.  I only take it at night, because it has heavy sedative effects. i.e. I take it at 7:00 pm, go to bed and if I wake up at 10:30 to use the bathroom I feel like I'm drunk, stumbling and uncoordinated.  Makes you sleep through, unfortunately didn't do much to help the pain, still wake up with pain in my back."