Sanofi files patent infringement lawsuit in USA against Merck

19 September 2016

French pharma major Sanofi (Euronext: SAN) said today that it filed a patent infringement suit against US peer Merck & Co (NYSE: MRK) on September 16, 2016 in the USA District Court for the District of Delaware. In its suit Sanofi alleges infringement of 10 patents relating to its blockbuster diabetes treatment Lantus (insulin glargine).

The suit was triggered by a notification received from Merck in early August, in which Merck stated that it had filed a New Drug Application with the US Food and Drug Administration for an insulin glargine drug product.

Merck also stated that its NDA included a paragraph IV certification challenging all of the ten Sanofi patents listed in the FDA Orange Book for Sanofi's Lantus and Lantus SoloStar products.

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