The way piracetam works is not fully understood. it may work by altering the availability of the brain s supply of neurochemicals (neurotransmitters, enzymes and hormones) or by improving the brain s 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.