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Teva will pay a royalty to Pfizer in return. Last year it filed a trademark infringement suit against Hanmi Pharmaceutical in Korea, alleging that Hanmi's pill is an exact copy of Viagra's blue-diamond shape.

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But Pfizer has also made it known that it won't tolerate copycats that overstep their bounds. Still, the generic assault against Pfizer continues, and not just with Viagra. In its latest bid to block generic competition, Pfizer has sued Indian drugmaker Torrent Pharmaceuticals for patent infringement.

Pfizer seeks to permanently bar Torrent from making or marketing the drug.

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Top 10 pharma advertising budgets of - Pfizer Top 10 pharma companies by revenue - Pfizer document. Pfizer has good reason to protect Viagra. Skip to main content.

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Top 10 pharma advertising budgets of - Pfizer Top 10 pharma companies by revenue - Pfizer. And Pfizer has fought back against counterfeiters by launching its own website to sell the real Viagra directly to patients. Pfizer sues India's Torrent in latest bid to fend off generic Viagra.

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Viagra's patent has already lapsed in Europe, Korea, and other regions, prompting dozens of generic drugmakers to flood the market with copycats. Even as it fights to extend Viagra's life, Pfizer is showing a willingness to compromise with generic rivals. Last week, a U.

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