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Efficacy of Olanzapine in Combination With Valproate or Lithium in the Treatment of Mania in Patients Partially Nonresponsive to Valproate or Lithium Monotherapy
Mauricio Tohen, MD, DrPH;
K. N. Roy Chengappa, MD;
Trisha Suppes, MD, PhD;
Carlos A. Zarate, Jr, MD;
Joseph R. Calabrese, MD;
Charles L. Bowden, MD;
Gary S. Sachs, MD;
David J. Kupfer, MD;
Robert W. Baker, MD;
Richard C. Risser, MSc;
Elisabeth L. Keeter, RN, MSN;
Peter D. Feldman, PhD;
Gary D. Tollefson, MD, PhD;
Alan Breier, MD
Arch Gen Psychiatry. 2002;59:62-69.
Background A 6-week double-blind, randomized, placebo-controlled trial was conducted
to determine the efficacy of combined therapy with olanzapine and either valproate
or lithium compared with valproate or lithium alone in treating acute manic
or mixed bipolar episodes.
Methods The primary objective was to evaluate the efficacy of olanzapine (5-20
mg/d) vs placebo when added to ongoing mood-stabilizer therapy as measured
by reductions in Young Mania Rating Scale (YMRS) scores. Patients with bipolar
disorder (n = 344), manic or mixed episode, who were inadequately responsive
to more than 2 weeks of lithium or valproate therapy, were randomized to receive
cotherapy (olanzapine + mood-stabilizer) or monotherapy (placebo + mood-stabilizer).
Results Olanzapine cotherapy improved patients' YMRS total scores significantly
more than monotherapy (-13.11 vs -9.10; P
= .003). Clinical response rates ( 50% improvement on YMRS) were significantly
higher with cotherapy (67.7% vs 44.7%; P<.001).
Olanzapine cotherapy improved 21-item Hamilton Depression Rating Scale (HAMD-21)
total scores significantly more than monotherapy (4.98 vs 0.89 points; P<.001). In patients with mixed-episodes with moderate
to severe depressive symptoms (DSM-IV mixed episode;
HAMD-21 score of 20 at baseline), olanzapine cotherapy improved HAMD-21
scores by 10.31 points compared with 1.57 for monotherapy (P<.001). Extrapyramidal symptoms (Simpson-Angus Scale, Barnes Akathisia
Scale, Abnormal Involuntary Movement Scale) were not significantly changed
from baseline to end point in either treatment group. Treatment-emergent symptoms
that were significantly higher for the olanzapine cotherapy group included
somnolence, dry mouth, weight gain, increased appetite, tremor, and slurred
speech.
Conclusion Compared with the use of valproate or lithium alone, the addition of
olanzapine provided superior efficacy in the treatment of manic and mixed
bipolar episodes.
From the Department of Psychiatry, Harvard Medical School, McLean Hospital,
Belmont, Mass (Dr Tohen); Lilly Research Laboratories, Indianapolis, Ind (Drs
Tohen, Baker, Feldman, Tollefson, and Breier, and Mr Risser and Ms Keeter);
Western Psychiatric Institute & Clinic, University of Pittsburgh Medical
Center, Pittsburgh, Pa (Drs Chengappa and Kupfer); Department of Psychiatry,
University of Texas Southwestern Medical Center, Dallas (Dr Suppes); Mood
and Anxiety Disorders Program, National Institute of Mental Health,
Bethesda, Md (Dr Zarate); Department of Psychiatry, Case Western Reserve,
Cleveland, Ohio (Dr Calabrese); Department of Psychiatry, Massachusetts General
Hospital, Harvard Medical School, Boston (Dr Sachs); Department of Psychiatry,
University of Texas Health Science Center, San Antonio (Dr Bowden). Drs Tohen, Feldman, Tollefson, and Breier and Mr Risser and Ms Keeter
are stockholders in Eli Lilly & Co.
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