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In page Treatment of bipolar disorder:

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Zonisamide (trade name Zonegran), another anti-convulsant, also may show promise in treating bipolar depression.[3] Various other anti-convulsants have been tested in bipolar disorder, but there is little evidence of their effectiveness.[1] Other anti-convulsants effective in some cases and being studied closer include phenytoin, levetiracetam, pregabalin and valnoctamide.[4]