muscle spasm
"First time using it.  Had discectomy in Feb '09 and now have Stenosis which required steroid injections which started today.  The Zanaflex worked amazingly quick on the muscles/tissues directly around L4 - L5.  Not doing much for the radiating spasming in the hip/buttocks/thigh though.  Do not seem to be having any real side effects which is key!  Wish it kicked in quicker though and hope it helps with restful sleep at night.  Optomistic!"