wisp is correct. the imbalances differe from person to person. that is one of the reasons as to why there are different amounts of medication that is to be taken, there are also different types of medication because each one affects other people differently. some people who are really hyper and take rhydilin (don't know spelling) are extremely mellow and almost seem lifeless, but that one is becoming less and less popular now... if i am fairly up to date on that.