Interesting question. It really does depend on the person and their body chemistry, but let me give you a rather interesting example. My therapist and psychiatrist aren't in contact with each other ( it's a long story), technically by my psychiatrist's evaluation I am just depressed and resistant to medicine. However my therapist has diagnosed me bipolar.

My medicine lineup includes a anti-psychotic which is supposed to demonstrate some mood stablizing effects. Which, if I am bipolar, would make sense why it's a working cocktail for me -- but also the medicine is used in conjunction with an antidepressant for unipolar depression..

so, am I bipolar? Am I just depressed? My medicines work because of my body chemistry, despite label. So, a mood stablizer may be all you need, or perhaps just the antipsychotic.. or both, it really isn't dependent on anything other than your body, tolerance, and chemistry.