Chronic hepatitis is classified etiologically. The autoimmune type pre
dominantly affects genetically predisposed females. It is classified a
ccording to the pattern of circulating autoantibodies. Long-term corti
costeroid therapy is usually successful. Associations between antibodi
es to liver-kidney microsomes and the hepatitis C virus can cause diag
nostic difficulties. Antiviral treatment of chronic hepatitis B and C
is aimed at controlling symptoms and abnormal biochemistry and particu
larly the progression to cirrhosis and liver cancer. Interferon-alpha
is usually employed but there is no consensus concerning the best regi
men. Patients who have developed cirrhosis rarely respond. Hepatitis C
is particularly liable to relapse after apparently successful treatme
nt. Serum hepatitis C viral RNA should be used to predict response and
monitor progress. Alternative therapies such as thymosin for hepatiti
s B virus and ribavirin for hepatitis C virus are being evaluated. Som
e nucleoside analogues such as FIAU (fluoro-iodo-arabino-furanosyl-ura
cil) have had disastrous results in clinical trials.