This study seeks to investigate whether tranylcypromine (Parnate®) might be an effective
treatment of bipolar depression. New treatments are needed, as there is little evidence that
standard antidepressants are effective in treating this condition, and the two antipsychotic
medications that have indications for bipolar depression can cause substantial side effects.
This study will focus specifically on currently depressed outpatients having a bipolar
history for whom at least one standard antidepressant medication was ineffective. Patients
will be treated openly with tranylcypromine for 8-10 months, depending on treatment response.