Antidepressants are  psychotropic drugs used primarily in the treatment of major depressive disorder, dysthymic disorder, and otherwise unnamed depressive disorders as specified in the International Classification of Diseases, Ninth Revision (ICD–9). They are also used in treating patients with certain types of schizophrenia and bipolar disorder, panic disorder, obsessive-compulsive disorder, attention deficit disorder, and some personality disorders. Types of antidepressants include tricyclics, such as Norpramin and Etrafon; monoamine oxidase inhibitor agents (MAOIs), such as Nardil and Parnate; selective serotonin reuptake inhibitors (SSRIs), such as Prozac, Zoloft, and Paxil; and miscellaneous antidepressants, such as Wellbutrin, Serzone, and Effexor. In Health Care in America: Trends in Utilization, antidepressants are classified by national drug classification (NDC) therapeutic class 0630.