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A Double-Blind, Randomized, Placebo-Controlled 4-Week Study on the Efficacy and Safety of the Purinergic Agents Allopurinol and Dipyridamole Adjunctive to Lithium in Acute Bipolar Mania.

Author(s): Machado-Vieira R, Soares JC, Lara DR, Luckenbaugh DA, Busnello JV, Marca G, Cunha A, Souza DO, Zarate CA, Kapczinski F

Affiliation(s): From the Bipolar Disorder Research Program, *Espirita Hospital of Porto Alegre (Drs. Machado-Vieira, Busnello, and Marca), *Faculdade de Biociencias-Pontificia Universidade Catolica do Rio Grande do Sul (Dr. Lara), and *Federal University of Rio Grande do Sul (Drs. Souza and Kapczinski), Porto Alegre, RS, Brazil; Mood Disorders Program, University of North Carolina at Chapel Hill (Dr. Soares); Mood and Anxiety Disorders Program, National Institute of Mental Health, National Institutes of Health and Department of Health and Human Services, Bethesda, Md. (Dr. Zarate and Mr. Luckenbaugh); and *Federal University of Santa Maria, Rio Grande do Sul, Brazil (Dr. Cunha). *Approved centers for random assignment of patients.

Publication date & source: 2008-07-29, J Clin Psychiatry., :e1-e9 [Epub ahead of print]

OBJECTIVE: The therapeutics for bipolar disorders are still far from adequate, and new options with improved effectiveness, safety, and tolerability in a wide range of patients are necessary. Preliminary data have suggested a role for dysfunctions targeting the purinergic system in mood disorders. This study aimed to evaluate the efficacy and tolerability of the purinergic agents allopurinol and dipyridamole combined with lithium in bipolar mania. METHOD: A randomized, placebo-controlled, double-blind study was performed in adult inpatients (N = 180) with a DSM-IV-TR diagnosis of bipolar I disorder, current episode manic with or without psychotic features (rapid cyclers and mixed episodes were not included). No antipsychotic agent was used during the study. Subjects were given fixed oral doses of either allopurinol 600 mg/day (N = 60), dipyridamole 200 mg/day (N = 60), or placebo (N = 60) added to lithium for 4 weeks. Subjects were rated at baseline and days 7, 14, 21, and 28 using the Young Mania Rating Scale (YMRS) as the primary efficacy measure. The study was conducted between September 2003 and September 2006. RESULTS: Allopurinol resulted in greater mean reductions in YMRS scores from baseline to day 21 (p < .001) and day 28 (p = .003) compared with placebo using a linear model analysis (d = 0.32, 95% CI = 0.07 to 0.57). Remission rates were significantly higher for allopurinol compared with dipyridamole and placebo (p = .008). Lithium showed a significant antimanic efficacy even in the placebo group. Decrease in plasma uric acid levels showed a significant positive association with antimanic effects in the allopurinol group (p < .001). CONCLUSION: Allopurinol is clinically effective and well-tolerated adjunctively with lithium in manic episodes and may represent an alternative approach in the treatment of acute mania, especially for those presenting tolerability and safety issues with antipsychotics. The present results strongly support the involvement of the purinergic system in the pathophysiology and therapeutics of bipolar disorder. Further placebo-controlled studies with allopurinol compared with standard mood stabilizers in mania and maintenance are warranted. TRIAL REGISTRATION: clinicaltrials.gov Identifier: NCT00560079.

Page last updated: 2008-08-10

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