Is there a generic version of Premphase?

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A generic version of Premphase is not currently approved for use in the U.S. The patent on Premphase held by Wyeth Pharmaceuticals does not expire until early 2015. Even if the patent had expired, it would be difficult for another pharmaceutical company to synthesize a medication that is similar enough to the estrogen component of Premphase to receive the approval of the U.S. Food and Drug Administration because of the estrogen component's complexity