muscle spasm
"After a bad car accident I've been prescribed several medications all of which had side effects that made them not possible to function with. Zanaflex is great, it starts working in about an hour after ingestion, it does make me sleepy so I take it one hour before bed and have a wonderful sleep. I wake up with out any grogginess the next morning.  The only reason I didn't rate it a 10 is that if I took it during the day I would be drowsy."