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Background: Early treatment of severe acute hepatitis B virus (HBV) infection with nucleos(t)ide analogues may prevent progression to acute liver failure (ALF)., Patients and Methods: The charts of 24 patients who were treated for severe acute HBV infection (either INR ≥ 1.5 or INR≥ 1.4 and total bilirubin ≥ 20 mg/dL at the referring institution or after admission) between April 2021 and May 2023 (inclusive) were evaluated retrospectively. Twelve patients were women; median [range] age: 48 [35-68]. Entecavir (0.5 mg/day) (n = 16) or tenofovir disoproxil fumarate (245 mg/day) (n =8) were used depending on availability., Results: Two patients required liver transplant which was performed successfully in one (no suitable donor for the other). Deterioration to ALF was prevented in 22 of the 24 cases (92%); these patients could be discharged after median (range) 12 (5-24) days following initiation of the antiviral drug. There was no significant difference in efficacy between the two antiviral agents. The anti-HBsAg antibody became positive in 16 patients (73%); one other patient became HBsAg negative at 1 month after discharge but was lost to follow up. Five patients (23%) are still HBsAg positive but all except one have started treatment in the last 6 months. One of the recently treated 4 patients stopped taking the antiviral drug at his own will and one has become anti-HIV antibody positive during follow up., Conclusion: Early treatment of severe acute HBV infection with entecavir or tenofovir disoproxil fumarate prevents the need for liver transplant and consideration of living donors., (Copyright © 2023 Wolters Kluwer Health, Inc. All rights reserved.)