muscle spasm
"I've been through a lot of medication for fibromyalgia... amitriptyline, methocarbamol, NSAIDS off the charts, Savella, Cymbalta... nothing works. Still, I believe nothing works but I will say this has helped me feel quite a bit better. Often in the night I have muscle cramps in addition to all the pain caused by fibromyalgia. If someone squeezes my arm, yes it still hurts.. but this drug has really lessened the pain all over. I give it a nine because I worry too much about how "young" this drug is. I worry about what it's doing to my liver and stuff too. 

I'm on 750MG a night and I take it before bed. It doesn't make me drowsy or help me sleep through the night specifically, but it really makes the muscles feel nice (and less cramping)."