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Background: Autoimmune hepatitis (AIH) is a chronic liver disease able to progress to acute liver failure, cirrhosis, and liver cancer. A significant proportion of patients fail to first-line therapy or develop severe toxicity., Aims: To assess safety and effectiveness of tacrolimus as a second-line therapy in AIH patients., Methods: Multicentric retrospective study of AIH patients treated with tacrolimus for at least 3 months as a second-line therapy. Effectiveness was defined as complete normalization of transaminases and IgG., Results: A total of 23 AIH patients were included in the final analysis. In 13% of patients tacrolimus was initiated because of toxicity to previous first-line treatments and the rest were switched because of previous non-efficacy. Tacrolimus was effective in 18 patients (78%; 95%CI: 55.20-91.92%). The median time receiving tacrolimus was 16 months (IQR 20). There was a sustained response with a significant improvement in all liver enzymes and IgG on last follow-up. Only one patient discontinued tacrolimus at the third month because of severe neuropathy, and ototoxicity. Responders were significantly older at diagnosis of AIH (41 ± 13 vs. 27 ± 10 years old; p = 0.0496)., Conclusion: Tacrolimus is effective and well tolerated as a second-line therapy in patients with AIH., (© 2020. Springer Science+Business Media, LLC, part of Springer Nature.)