 - use of injectable antipsychotic drugs or electroconvulsive therapy within past 6 months, or currently using carbamazepineor an oral antipsychotic drug in a dose that is higher than 8 milligrams per day in risperidone equivalents, of long-acting risperidone in an earlier study, of clozapine, or use of investigational drugs within 30 days, or of electroconvulsive therapy within past 6 months 