muscle spasm
"During high school I began having several episodes of ridiculous pain in my back (I was a very healthy athlete at that time also) and ended up experiencing numbness in my L leg to the point I could hardly ambulate (I say ambulate because walking was NOT the only thing it effected). My dad, luckily an M. D., gave me samples of Skelaxin. As long as I took it appr. 2.5hrs before a practice or game, it only helped. After that time period, however, my coordination was markedly decreased, though it did tend to take the right fielder by surprise ;) In short, back then I loved it.
I just started back on this after appr. 2  yrs off for a potential slipped/herniated/fromhell disc in the L2-L4 region soo.... Fingers crossed!!"