All febrile episodes (a total of 276) which occurred in 85 patients with acute myelogenous leukaemia treated in four Norwegian centres during the period 1990-1994 were studied retrospectively in order to assess the efficacy of antibiotic treatment. 72% of these episodes were initially treated with benzyl penicillin and aminoglycoside (standard treatment), while alternative empirical treatment was given in the remaining cases. The treatment was successful in 94% of the febrile episodes initially treated with standard treatment and in 96% of the episodes which received alternative antibiotics. For both types of treatment, a change to second line antibiotic regimen was made for various reasons in a majority of cases. The combination benzyl penicillin and aminoglycoside seems to be a safe empirical treatment for febrile neutropenia in patients with acute myelogenous leukaemia in our treatment centres, provided that the treatment is modified in patients with unsatisfactory clinical response.