This is the worst medicine on the market. It is called Flexeril. It does not work. It will make you sleepy and feel horrible. If you have muscle pain, a sprain, anything like that, doctors like to prescibe it because it won't kill you or get you addicted.. Everyone I know has some stashed in the back of their medicine cabinet at home, and say the same thing. "It did nothing." I don't know why you are asking this, but if you have this medicine, you must be in some sort of pain or muscle problem. Don't even bother taking it. Try the muscle relaxant SOMA. It is the only one that works. Skelactin is just as bad.. Good luck..