BRIEF—Eisai to divest warfarin rights in Japan to Sawai

28 March 2025

Japanese drugmaker Eisai says it has entered into an agreement to divest its rights for the oral anticoagulant warfarin (warfarin potassium) in Japan to Sawai Pharmaceutical.

Warfarin has been widely used by patients in Japan for a long time since its launch in 1962.

Eisai has determined that divesting rights for warfarin to Sawai is the most optimal choice to continue contributing to a greater number of patients.

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