List of products in the National Drug Code with proprietary name . This medication is used to treat depression. Treating depression can improve your mood and sense of well-being and allow you to enjoy everyday life more. Amoxapine is a tricyclic antidepressant. It works by restoring the balance of natural chemicals (neurotransmitters) in the brain. Because amoxapine has some effects that are similar to those of major tranquilizers, it may work better in patients who have agitation or anxiety along with depression.