The brain has been called the final frontier in medical research, and there have been incredible developments in the last fifty years. Serotonin isn’t the only neurotransmitter that has been identified as the most likely target for medication development. Medical research has identified other neurotransmitters and potential targets of action to treat depression. One of those neurotransmitters is Noradrenaline, which can be used to treat severe depression in patients. Learning about various neurotransmitters in the brain helps us to find causes of other mental illnesses in addition to depression. For instance, dopamine is another neurotransmitter and it’s believed that an overactive dopamine system can cause schizophrenia.