Sumitomo, Takeda Sue Hetero to Block Copies of Menstruation Drug

Copies of Myfembree proposed by a unit of Hetero Labs Ltd. infringe four patents Sumitomo Pharma Co. and Takeda Pharmaceutical Co. either own or license for Sumitomo Pharma’s drug used to treat heavy periods and endometriosis pain, a federal lawsuit said.

The subsidiary Annora Pharma Private Ltd.'s proposed generic version of Myfembree infringes US Patent Nos. 11,795,178, 11,033,551, 11,957,684, and 11,793,812, according to a complaint docketed March 28 in the US District Court for the District of Delaware.

Takeda owns the ‘178 patent and licenses it exclusively to Sumitomo Pharma and to Pfizer Inc., also ...