The risk of congestive heart failure restricts the clinical use of doxorubicin to cumulative doses of 450-550 mg/m2, when it is given using high-dose rapid intravenous application. As the high peak serum levels which follow rapid administration seem to be correlated with cardiotoxicity, application schedules leading to lower peak serum concentrations have been developed. This paper reviews the influence of those schedules on cardiotoxicity, non-cardiac toxicities, pharmacokinetic data and antineoplastic efficacy. While the reduction of cardiotoxicity by long-term application schedules is well documented, much less can be said about the antitumor effect of those schedules. Controlled studies dealing with this problem are needed. This review provides a base for that purpose.