Earlier quoted context omitted.
His new practice will be medication management, not psychotherapy.
When people go this route, do they still see or talk to another therapist? I always figured people's chemical imbalances were influenced by behavior. If you just treat the chemical imbalance without addressing the behavior, isn't that rather risky?
They do. Psychotherapists cannot prescribe medication but are licensed to deliver psychotherapy. Psychiatrists, who are MDs, can prescribe medication but also can do psychotherapy if they choose to do so. I even know psychiatrists that only do psychotherapy and won't do medication management. To complicate further, non-psychiatrist MDs can also prescribe certain classes of psychotropic medication.
Either way, pharmacotherapy is rarely administered alone, usually psychotherapists refer patients to psychiatrists if they believe pharmacotherapy can be beneficial, and with patient's consent they can share notes. He will be that therapist.