Hepatotoxicity associated with isoniazid preventive therapy: a 7-year survey from a public health tuberculosis clinic.

<bold>Context: </bold>Isoniazid preventive therapy for latent tuberculosis (TB) infection has been debated because of the risk of hepatotoxicity. The frequency of hepatotoxicity was 0.5% to 2.0% in early studies but may have changed with new criteria for diagnosis and patient selection.<bold>Objective: </bold>To determine the rate of isoniazid hepatotoxicity in patients managed according to current guidelines and practice standards.<bold>Design: </bold>Prospective cohort study.<bold>Setting: </bold>A public health clinic operated by the TB control program of a city-county public health agency.<bold>Patients: </bold>A total of 11141 consecutive patients who started a regimen of isoniazid preventive therapy for latent TB infection from January 1989 through December 1995.<bold>Main Outcome Measures: </bold>The rate of developing symptoms and signs of hepatotoxicity among all persons starting isoniazid preventive therapy, among all those completing therapy, and by age, sex, and race.<bold>Results: </bold>Eleven patients (0.10% of those starting, and 0.15% of those completing treatment) had hepatotoxic reactions to isoniazid during preventive treatment. The rate of hepatotoxicity in persons receiving preventive therapy increased with increasing age (chi2 for linear trend = 5.22, P=.02) and there were trends toward increased rates in women (odds ratio [OR], 3.30; 95% confidence interval [CI], 0.87-12.45; chi2 = 3.28; P=.07) and in whites (OR, 2.60; 95% CI, 0.75-8.95; chi2 = 3.08; P=.08).<bold>Conclusions: </bold>The rate of isoniazid hepatotoxicity during clinically monitored preventive therapy was lower than has been reported previously. Clinicians should have greater confidence in the safety of isoniazid preventive therapy. [ABSTRACT FROM AUTHOR]