Jan 16, 2024 · - The only treatment for hemophilia B FDA approved for up to 14-day dosing is now available in larger, 3500 IU vial size - IDELVION is now offered in 5 convenient vial sizes to fit any dosing regimen: 250, 500, 1000, 2000 and 3500 IU - New vial option delivers on CSL Behring’s promise to enhance current treatments and provide more alternatives to patients