- Concurrent use of other psychotropic medications; all psychotropic medications (excluding benzodiazepines) must be stopped at least one week prior to entry into the initial PE phase of the study. Patients may remain on concomitant benzodiazepines (<2 mg/d clonazepam or its equivalent), as long as the benzodiazepine therapy was initiated at least 2 months prior to randomization and at a constant dose for >4 weeks prior to randomization; the dose will be held constant through the study.