muscle spasm
"After trying dozens of muscle relaxers over the past 1  years and having side effects like non-stop vomiting, of severe nausea (so bad that I could not get my head out of a trash can) not to mention the sharp pains in my stomach and not being able to eat anything. I figured this was just another trial. Boy was I shocked when I tried this one. Granted it's not perfect, but I have part of my life back and am not neurotic that I have at least 3 ziplock bags in my purse and one in each sweater pocket in case I can not get to the rest room in time."