IVAL L. SALYER, M.D.; MICHAEL H. CYNAMON, M.D.
To the editor: We read with interest the letter, "Stop Isoniazid Prophylaxis," by Israel (Ann Intern Med 80: 672-673, 1974) and would like to take issue with several points he raised.
It is clear that isoniazid (INH) is a potentially hepatotoxic agent (1, 2) and that patients on prophylaxis require close supervision. The Center for Disease Control currently recommends monitoring for symptoms monthly but considers periodic liver function tests to be of little additional value unless clinically indicated (1). Apparently most cases of INH-associated hepatitis are reversible if the medication is withdrawn soon after evidence of hepatic dysfunction is observed
IVAL L. SALYER, MICHAEL H. CYNAMON. Isoniazid. Ann Intern Med. 1974;81:272–273. doi: 10.7326/0003-4819-81-2-272
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Published: Ann Intern Med. 1974;81(2):272-273.
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