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Aliso Viejo-based Avanir Pharmaceuticals Inc.’s shares rose today on positive clinical trial results for a potential Alzheimer’s disease treatment.

The drugmaker’s shares were up 75% to a market value of about $2 billion in early afternoon trading.

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Avanir said in a news release that a second-phase clinical trial for its AVP-923 drug candidate showed significantly reduced agitation in Alzheimer’s patients who received the drug.

AVP-923 is also known as Nuedexta and is Avanir’s primary drug. Nuedexta is used to treat psuedobulbar affect, a disorder that results in uncontrollable laughing or crying.