A Study to Learn About the Study Medicine -Hympavzi in Congenital Hemophilia Patients Without Inhibitors in Japan.

For patients aged 12 years or older and weighing at least 35 kg, marstacimab is administered subcutaneously at a dose of 300 mg as the initial dose, followed by 150 mg once weekly. If the patient weighs 50 kg or more and shows an inadequate response, the dose may be increased to 300 mg once weekly for subcutaneous administration.