6. Current use of psychotropic medications (ie, drugs normally prescribed for depression, mania, anxiety, insomnia, or psychosis) that cannot be discontinued 2 weeks prior to randomization. Fluoxetine is prohibited within 5 weeks of randomization. In the event of inadvertent administration of psychotropic medications during the 2 weeks prior to randomization, continued eligibility will be assessed on a case by case basis by the investigator and the medical monitor.