Johnson & Johnson sued Samsung Bioepis for allegedly breaching a contract agreement over its launch of a biosimilar to Stelara, J&J's blockbuster psoriasis treatment.

Janssen has sued Samsung Bioepis, alleging it violated a settlement agreement by authorizing an unauthorized Stelara® biosimilar, potentially harming market competition.

Samsung Bioepis allegedly entered into an agreement with a third-party health company, allowing it to market its own private label of a Stelara biosimilar.

Johnson & Johnson filed a lawsuit against Samsung Bioepis for allegedly breaching their agreement over the launch of Stelara's biosimilar, Pyzchiva. J&J seeks to prevent its U.S. sales, claiming unauthorized sublicense dealing damaged J&J's market share.

Samsung Bioepis has allegedly sub-licensed its Stelara biosimilar rights to a health conglomerate, breaching a previous settlement.

As biosimilar versions of a big-selling Johnson & Johnson medicine reach the U.S. market, the health care giant accused one manufacturer of striking a

Johnson & Johnson said on Monday it had filed a lawsuit against Samsung Bioepis for breaching its contract agreement with the drugmaker over the launch of a biosimilar to Stelara, J&J's autoimmune drug.

Johnson & Johnson (NYSE: JNJ) has taken legal action against Samsung Bioepis, accusing the South Korean biotech of violating a settlement agreement by authorizing a third party to market a private-label biosimilar version of Stelara (ustekinumab).