Isoniazid has been recognized as a cause of liver dysfunction in some patients receiving antituberculous therapy. The medical literature contains reports of isoniazid-induced hepatic injury in adults, but essentially none in children. We used this drug to treat a 6-year-old Caucasian boy for active tuberculosis, and he suffered a reaction characterized by high fever, a morbilliform exanthem, peripheral eosinophilia, enlargement of the liver, and abnormal liver function and histologic findings. The histologic appearance of the liver lesion and the clinical manifestations were suggestive of a hypersensitivity reaction, probably of the delayed type.
Rudoy R, Stuemky J, Poley JR. Isoniazid Administration and Liver Injury. Am J Dis Child. 1973;125(5):733-736. doi:10.1001/archpedi.1973.04160050077016