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Merck & Co. Leans on Recently Upheld Patent in New Janumet Suit

Oct. 3, 2022, 10:31 PM

Merck & Co., fresh off a ruling that upheld a patent related to an active ingredient in its diabetes drugs, alleges in a lawsuit filed Monday that a generic version of Janumet proposed by Prinston Pharmaceutical Inc. infringes the patent.

Merck Sharp & Dohme LLC says Prinston, a unit of Zhejiang Huahai Pharmaceutical Co., notified it in an Aug. 19 letter that it was seeking the US Food and Drug Administration’s approval to sell its Janumet copy before the patent’s expiration, according to a complaint filed in the US District Court for the District of Delaware.

The patent covers ...