"Natco Pharma Ltd and Alvogen have settled the patent infringement suit filed by Gilead Sciences Inc, Hoffmann-La Roche Inc, F. Hoffmann-La Roche Ltd and Genentech Inc in New Jersey District Court," Natco said in a regulatory filing.

Tamiflu is used in the treatment of bird and swine-flu infections.

Natco and Alvogen partnered on the first Abbreviated New Drug Application (ANDA) containing a paragraph IV certification filed with the US Food and Drug Administration (FDA) for generic versions of Tamiflu oral capsules (oseltamivir phosphate) of 30 mg, 45 mg and 75 mg strengths.

In 2011, Natco had challenged Gilead's patent on Tamiflu (Oseltamivir Phosphate) alleging that Gilead's patent on the drug is invalid.

Tamiflu was developed by Gilead, which receives royalties on the drug's sale from Roche Holding. Shares of Natco were trading at Rs 537.65, up 1.03 percent from previous close on BSE.

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