Health Canada approves PreHevbrio for hepatitis B

It can be expected that hepatitis D will also be prevented by immunization with PreHevbrio as hepatitis D (caused by the delta agent) does not occur in the absence of hepatitis B infection.

The approval was based on clinical data in the new drug submission (NDS), which highlighted the positive results from two pivotal, randomized, double-blind, controlled Phase III clinical studies, PROTECT and CONSTANT. Data from these studies were published, respectively, in The Lancet Infectious Diseases in May 2021 and The Journal of the American Medical Association Network Open in October 2021. Both studies compared PreHevbrio to Engerix-B, a single-antigen HBV vaccine. Results from the PROTECT study showed that PreHevbrio elicited higher rates of seroprotection in all subjects age 18+ (91.4% vs. 76.5%), including in adults age 45+ (89.4% vs. 73.1%). The PROTECT study results also showed that PreHevbrio induced higher rates of seroprotection in subjects with diabetes (83.3% vs. 58.3%) as well as in subjects with body mass index (BMI) over 30 (89.22% vs. 68.11%). The integrated safety analysis of both studies demonstrated good tolerability with no unexpected reactogenicity. The most common adverse events in all age groups were injection site pain and tenderness, myalgia, and fatigue, all which generally resolved without intervention in 1-2 days.