muscle spasm
"I have been taking zanaflex for about 2 years. The best thing about this medicine is it helps me sleep and for me there is no grogginess in the morning. I'm totally alert. Not like with other muscle relaxants. However the medicine usually last about 3-4 hours so it's quite common to wake up in the middle of the night. I give it an 8 because it does work really well for me however I wish the effects would last a little longer to get a full nights rest and also because I can't take it in the day because it knocks me out.....cold."