June 19, 2026 -- Zenyaku Kogyo Co., Ltd. (website in Japanese only) and Chugai Pharmaceutical Co., Ltd. (TOKYO: 4519) announced today that Zenyaku, the marketing authorization holder, obtained regulatory approval from the Ministry of Health, Labour and Welfare (MHLW), for an additional dosage and administration*1 of an anti-CD20 monoclonal antibody Rituxan® intravenous infusion 100 mg and 500 mg [generic name: rituximab (genetical recombination)] (hereafter “Rituxan”), which is co-promoted by bo