Pfizer’s patent on Viagra invalid

The Supreme Court of Canada has unanimously decided that Pfizer Canada Inc.’s Viagra patent is invalid as it did not disclose the exact chemical compound effective in treating erectile dysfunction (sildenafil). The generic drug company Teva Canada was one to challenge the patent and will now be eligible to put it’s own version of the “little blue pill” on the market.

The court decision’s clarification of disclosure requirements for patents will apply to all patents in Canada.

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