Pfizer loses Viagra patent fight

Charging that Pfizer Inc. had been gaming the patent system by not providing enough details on the active ingredients of Viagra, Canada's Supreme Court has effectively allowed the erectile dysfunction drug to go generic.

Reuters reported that Canada's highest court voted unanimously Thursday to nullify Pfizer's Viagra patent, deciding in favor of Israel-based generics maker Teva Pharmaceutical Industries Ltd. in a case that had gone the other way in lower courts.

The Canadian Viagra patent had been scheduled to terminate in 2014. Pfizer had previously been successful in defending its patent against appeals in the United States as well as other countries.

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