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A proposed generic version of the erectile dysfunction treatment Viagra� (sildenafil citrate) would infringe an existing patent, according to a ruling by the Canadian Federal Court.
Drug firm Pfizer said the court in Toronto found Apotex’s planned generic would have impacted on its second medical use patent.
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The judges granted an application from Pfizer for an order preventing Apotex from launching the generic treatment until the Canadian patent expires in 2014.
The decision is subject to appeal.
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