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Pharmacopsychiatry 2014; 47(02): 43-52
DOI: 10.1055/s-0033-1363258
Review
© Georg Thieme Verlag KG Stuttgart · New York

Treatments for Acute Bipolar Depression: Meta-analyses of Placebo-controlled, Monotherapy Trials of Anticonvulsants, Lithium and Antipsychotics

V. Selle
1   International Consortium for Bipolar Disorder Research, McLean Hospital, Belmont, Massachusetts, USA
2   Department of Psychiatry, Viarnetto Clinic, Lugano, Switzerland
,
S. Schalkwijk
1   International Consortium for Bipolar Disorder Research, McLean Hospital, Belmont, Massachusetts, USA
3   Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, Utrecht, Netherlands
,
G. H. Vázquez
1   International Consortium for Bipolar Disorder Research, McLean Hospital, Belmont, Massachusetts, USA
4   Department of Neuroscience, Palermo University, Buenos Aires, Argentina
,
R. J. Baldessarini
1   International Consortium for Bipolar Disorder Research, McLean Hospital, Belmont, Massachusetts, USA
5   Department of Psychiatry, Harvard Medical School, Boston, Massachusetts, USA
› Author Affiliations
Further Information

Publication History

received 05 September 2013
revised 24 November 2013

accepted 25 November 2013

Publication Date:
18 February 2014 (online)

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Abstract

Background:

Optimal treatments for bipolar depression, and the relative value of specific drugs for that purpose, remain uncertain, including agents other than antidepressants.

Methods:

We searched for reports of placebo-controlled, monotherapy trials of mood-stabilizing anticonvulsants, second-generation antipsychotics, or lithium for acute major depressive episodes in patients diagnosed with type I or II bipolar disorder and applied random-effects meta-analysis to evaluate their efficacy, comparing outcomes based on standardized mean drug-placebo differences (SMD) in improvement, relative response rates (RR), and number-needed-to-treat (NNT).

Results:

We identified 24 trials of 10 treatments (lasting 7.5 weeks, with ≥50 collaborating sites/trial) that met eligibility criteria: lamotrigine (5 trials), quetiapine (5), valproate (4), 2 each for aripiprazole, olanzapine, ziprasidone, and 1 each for carbamazepine, lithium, lurasidone, and olanzapine-fluoxetine. Overall, pooled drug-over-placebo responder-rate superiority (RR) was moderate (29% [CI: 19–40%]), and NNT was 8.2 (CI: 6.4–11). By SMD, apparent efficacy ranked: olanzapine+fluoxetine≥valproate>quetiapine>lurasidone>olanzapine, aripiprazole, and carbamazepine; ziprasidone was ineffective, and lithium remains inadequately studied. Notably, drugs were superior to placebo in only 11/24 trials (5/5 with quetiapine, 2/4 with valproate), and only lamotrigine, quetiapine and valproate had > 2 trials. Treatment-associated mania-like reactions were uncommon (drugs: 3.7%; placebo: 4.7%).

Discussion:

Controlled trials of non-antidepressant treatments for bipolar depression remain scarce, but findings with olanzapine-fluoxetine, lurasidone, quetiapine, and perhaps carbamazepine and valproate were encouraging; lithium requires adequate testing.

Key words

anticonvulsants - antipsychotics - bipolar depression - controlled-trials - lithium - meta-analysis
 

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