Hundreds of thousands of people are on medications to address mood and mental health disorders. Many people try one medication, and when it doesn't work, they feel hopeless. What they do not realize is that, since we cannot accurately measure the levels of neurochemicals in your brain, diagnosis and prescribing is part art, and part science. A variety of different chemical imbalances besides low serotonin can cause depressive symptoms, for example. In this episode we will discuss three common classes of medications: Antidepressants, Mood Stabilizers and Antipsychotics, the neurotransmitters on which they are believed to work and the symptoms of insufficiency and excess of each of these neurotransmitters.