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Background: A series of open studies suggests that topiramate has efficacy in bipolar disorder. To further investigate the potential value of topiramate as an antimanic agent, we conducted an open trial in 11 manic patients. Method: Eleven patients with bipolar I disorder with an acute manic episode (DSM-IV) were treated with a mood stabilizer and/or antipsychotics in sufficient and fixed doses. All had a Young Mania Rating Scale (YMRS) score of at least 24 (mean±SD= 33.5±8.1). Topiramate was added after stable plasma levels of concomitant mood stabilizers had been reached and was titrated within 1 week to a final dose in the range of 25 to 200 mg/day, depending on clinical efficacy and tolerability. Topiramate was discontinued after 10 days, while concomitant medication remained unchanged. After 5 days, topiramate was reintroduced at similar or increased dosages for another 7 days. Patients were …