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In a closely watched case, Allergan (AGN) won a lawsuit in which it used a novel legal theory to blunt competition from a compounding pharmacy, although the victory came at a price.

Here’s the backstory: The drug maker accused Imprimis Pharmaceuticals of falsely advertising compounded versions of its eye treatments for cataracts and glaucoma because the smaller company failed to follow federal regulations.

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Specifically, Allergan argued that its competitor’s products were not legally compounded, but instead were mass-manufactured formulations of new drugs not approved by regulators. The bigger drug maker further claimed it lost business because doctors may have believed the Imprimis medications were, in fact, approved.

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