Fungal infections are a major cause of morbidity and mortality in patients with hematological malignancies. Candida and Aspergillus species are the most important opportunistic fungal pathogens in this patient population. Amphotericin B is the treatment of choice, but its administration is often hampered by severe side-effects, which may be reduced by continuous infusion of this drug. We describe 17 consecutive patients with hematological malignancies, suffering from fever of unknown origin with possible fungal infections, treated with amphotericin B as continuous infusion compared with a control group of 10 patients treated with conventional rapid infusion of amphotericin B over 2 - 6 h. No acute side-effects or severe nephrotoxicity were observed during continuous infusion of amphotericin B. Target doses were reached faster in patients with continuous infusion of amphotericin B than in patients with rapid infusion. We conclude that continuous infusion of amphotericin B is safe in neutropenic patients with hematological malignancies.