Clozapine May Cause Severe Neutropenia. The U.S. Food and Drug Administration (FDA) is changing certain safety requirements for clozapine, a medication used to treat patients with schizophrenia. According to a Drug Safety Communication issued on Sept. 15, the agency is modifying requirements for monitoring, prescribing, … [Read more...] about FDA Updates Requirements for Clozapine in Light of Neutropenia Risk