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Isoniazid-induced hepatotoxicity in children with latent tuberculosis infection. BACKGROUND: We aimed to determine overall incidence of severe and mild isoniazid (INH) hepatotoxicity and outcome of hepatotoxicity in children who were receiving INH for latent tuberculosis. METHODS: Patients who had received isoniazid for treatment of latent tuberculosis were included in the study. Hepatotoxicity was classified according to the World Health Organization Toxicity Classification Standards. RESULTS: Among 1038 patients, overall hepatotoxicity was observed in 22 patients (2.2%), while 5 patients (0.48%) had moderate-severe hepatotoxicity; while other 17 patients had grade I-II hepatotoxicity (1.63%). Age and gender did not appear to be risk factors for hepatotoxicity. The median time for therapy rechallenge in patients with grade III-IV hepatotoxicity was 21 days (ranging from 14 to 25 days). CONCLUSIONS: Isoniazid hepatotoxicity is lower and generally reversible after cessation of INH in children. The grade of hepatotoxicity affects the duration for recovery of hepatotoxicity and restarting of INH therapy.