Are a norclozapine level and the clozapine-norclozapine ratio useful?

By Jose de Leon, MD Dr. de Leon is Professor of Psychiatry, University of Kentucky College of Medicine and a Member of the Editorial Board of Simple and Practical Mental Health. Questions from a Member:  1. When checking a clozapine level, is it useful to add the norclozapine level to it? 2. Also, is there…