The way piracetam works is not fully understood It may work by altering the availability of the brains supply of neurochemicals neurotransmitters enzymes and hormones or by improving the brains oxygen supply What is it used for Uncontrollable twitching or jerking of the muscles particularly in the arms and legs caused by a problem in the brain or nervous system myoclonus of cortical origin This medicine is used in combination with other treatments for this condition