Preliminary randomized, double-blind, placebo-controlled trial of pramipexole added to mood stabilizers for treatment-resistant bipolar depression.
OBJECTIVE
Previous studies suggest that the dopamine agonist pramipexole may possess antidepressant properties. The authors conducted a preliminary randomized, placebo-controlled trial to determine the safety and antidepressant efficacy of pramipexole in treatment-resistant bipolar depression.


METHODS
Twenty-two depressed outpatients with DSM-IV nonpsychotic bipolar disorder were randomly assigned to receive placebo or flexibly dosed pramipexole (mean maximum dose=1.7 mg/day, SD=1.3) added to existing mood stabilizers for 6 weeks. The primary outcome measure was response, defined as improvement in Hamilton Depression Rating Scale score of 50% or more over the baseline score; secondary analyses involved changes in Clinical Global Impression (CGI) severity scores.


RESULTS
More patients given pramipexole (10 [83%] of 12) than patients given placebo (six [60%] of 10) completed the study. Eight (67%) of 12 patients taking pramipexole and two (20%) of 10 taking placebo had an improvement of at least 50% in their Hamilton depression scale scores. The mean percentage of improvement from baseline Hamilton depression scale scores was greater for patients taking pramipexole (48%) than for those taking placebo (21%). Mean improvements in CGI severity were also greater with pramipexole than placebo. No patients discontinued the study because of adverse events except for one patient who became hypomanic while taking pramipexole.


CONCLUSIONS
Pramipexole was a safe and effective antidepressant among patients with bipolar depression. Larger randomized, controlled trials are needed to affirm these initial observations.
Goldberg
Joseph F
JF
Department of Psychiatry, Weill Medical College of Cornell University, New York, NY, USA. jgoldber1@lij.edu
Burdick
Katherine E
KE
Endick
Carrie J
CJ
D000328:Adult; D000553:Ambulatory Care; D000927:Anticonvulsants / Q000008:administration & dosage* / Q000009:adverse effects; D018692:Antimanic Agents / Q000008:administration & dosage* / Q000009:adverse effects; D052160:Benzothiazoles; D001714:Bipolar Disorder / Q000175:diagnosis / Q000188:drug therapy* / Q000523:psychology; D003865:Major Depressive Disorder / Q000175:diagnosis / Q000188:drug therapy* / Q000523:psychology; D018491:Dopamine Agonists / Q000008:administration & dosage* / Q000009:adverse effects; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D004334:Drug Administration Schedule; D004351:Drug Resistance; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010552:Personality Assessment; D010865:Pilot Projects; D000077487:Pramipexole; D013844:Thiazoles / Q000008:administration & dosage* / Q000009:adverse effects
D000927:Anticonvulsants; D018692:Antimanic Agents; D052160:Benzothiazoles; D018491:Dopamine Agonists; D013844:Thiazoles; D000077487:Pramipexole