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Halozyme wins court order to block Merck’s injected Keytruda in select European markets

By Thomson Reuters Oct 7, 2026 | 8:29 AM

Oct 7 (Reuters) – Biopharma company Halozyme said on Wednesday that a Dutch patent court ruled in its favor against Merck, ordering ​the drugmaker to halt the manufacture and ‌sale of injectable Keytruda in eight European markets.

Here are some details:

• Halozyme said a specialized Dutch patent court in The Hague found that Merck had infringed one ‌of ​its patents covering MDASE, Halozyme’s ⁠technology for rapid, high-volume ⁠under-the-skin drug delivery.

• The court ordered Merck to stop the production and sale of injectable Keytruda in Belgium, Denmark, France, Ireland, Italy, ​Sweden, Switzerland and the Netherlands.

• The drugmaker has been counting on the simpler-to-use subcutaneous version ⁠of the drug, known ⁠as Keytruda SC, to help drive ​growth as key patents on its original intravenous version ​expire later in the decade.

• “We strongly disagree ‌with the Dutch court’s decision to grant a cross-border injunction. We consider Halozyme’s patent to be invalid globally and its allegation of infringement to ⁠be without merit,” a Merck spokesperson said in a statement.

• The company said it is evaluating next ⁠steps.

• Halozyme has ‌also sued Merck for patent ⁠infringement in the US, alleging the ​under-the-skin ‌formulation of Keytruda infringes 15 patents ​that Halozyme ⁠has filed since 2011.

• The company sued Merck in Germany and was granted a preliminary injunction last year, stopping Merck’s launch of Keytruda SC in Germany.

(Reporting by Christy Santhosh in Bengaluru; Editing by ​Shreya Biswas)