Isoniazid hepatotoxicity in children.

One hundred sixteen children, including 50 less than 10 years of age, received isoniazid therapy for tuberculous infection. Determinations of serum glutamic oxaloacetic transaminase concentrations at time of institution of therapy, 6 to 20 weeks later, and again at the completion of the therapeutic course, showed no evidence of hepatotoxicity. Clinical symptoms were never such that discontinuation of therapy was necessary.