When do doctors prescribe anti-psychotic drugs?

Misnomer. What you call antipsychotic drugs is merely a way to adjust a brain chemical called Dopamine. This chemical mediates many different emotional states. Obviously one of these states is psychosis in any of its forms. It is also useful in some depressions.

Related Questions

What would lead a doctor to prescribe Abilify (aripiprazole) in treating depression since it is an anti psychotic?

2 reasons. 1. Abilify (aripiprazole) can be used to augment an antidepressant if the person has an inadequate response to it. This can lead to a more robust reduction of depressive symptoms. 2. It can be used for severe depression with psychotic features. Read more...
Abilify (aripiprazole) To augment antidepressants if partial response or poor tolerance to high doses, to treat psychotic features in depression, & to better stabilize receptors in brain causing mood alterations. Read more...